NiFe(oxy)hydroxide(NiFeOOH)has been widely studied as a catalyst for oxygen evolution reaction(OER),but its activity is still not satisfactory.Although metal doping has been employed as a promising strategy for addres...NiFe(oxy)hydroxide(NiFeOOH)has been widely studied as a catalyst for oxygen evolution reaction(OER),but its activity is still not satisfactory.Although metal doping has been employed as a promising strategy for addressing this issue,the instability and leaching of the high-valence dopant metals remain considerable challenges.Herein,an array of Cr-doped NiFeOOH nanosheets was in situ synthesized on nickel foam via a one-step hydrothermal method.The doping of NiFeOOH with Cr was found to induce partial electron transfer from Ni and Fe to Cr atoms,thereby modulating the electronic structure of the catalyst and enhancing its intrinsic activity.Electrochemical and in situ Raman spectroscopy analyses showed that Fe active sites with lower charge density enhance the adsorption of^(*) OH and reduce the formation energy barrier of the*OOH intermediate during OER,thereby accelerating the OER.Moreover,Fe was found to promote the transfer of additional electrons to Cr,leading to electron accumulation at Cr sites.This electron accumulation effectively prevents Cr from excessive oxidation and leaching under anode potentials,thereby maintaining the structural stability of the catalyst.The optimized Cr-doped NiFeOOH self-supported electrode exhibited a current density of 50 mA/cm^(2) with an overpotential of only 239 mV and remained stable for 100 h at 600 mA/cm^(2) in 1 mol/L KOH.展开更多
Amorphous two-dimensional transition metal oxide/(oxy)hydroxide(2D TMO/TMHO)nanomaterials(NMs)have the properties of both 2D and amorphous materials,displaying outstanding physicochemical qualities.Therefore,they demo...Amorphous two-dimensional transition metal oxide/(oxy)hydroxide(2D TMO/TMHO)nanomaterials(NMs)have the properties of both 2D and amorphous materials,displaying outstanding physicochemical qualities.Therefore,they demonstrate considerable promise for use in electrocatalytic water splitting applications.Here,the primary amorphization strategies for achieving the 2D TMO/TMHO NMs are comprehensively reviewed,including low-temperature reaction,rapid reaction,exchange/doping effect,ligand modulation,and interfacial energy confinement.By integrating these strategies with various physicochemical synthesis methods,it is feasible to control the amorphization of TMO/TMHO NMs while maintaining the distinctive benefits of their 2D structures.Furthermore,it delves into the structural advantages of amorphous 2D TMO/TMHO NMs in electrocatalytic water splitting,particularly emphasizing recent advancements in enhancing their electrocatalytic performance through interface engineering.The challenges and potential future directions for the precise synthesis and practical application of amorphous 2D TMO/TMHO NMs are also provided.This review aims to establish a theoretical foundation and offer experimental instructions for developing effective and enduring electrocatalysts for water splitting.展开更多
A more feasibly convergent synthesis of selective estrogen receptor degrading agent(S)-8-(4-((1-(3-fluoropropyl)-pyrrolidin-3-yl)oxy)phenyl)-7-(4-hydroxyphenyl)-5,6-dihydronaphthalen-2-ol was reported,featured with co...A more feasibly convergent synthesis of selective estrogen receptor degrading agent(S)-8-(4-((1-(3-fluoropropyl)-pyrrolidin-3-yl)oxy)phenyl)-7-(4-hydroxyphenyl)-5,6-dihydronaphthalen-2-ol was reported,featured with concise work up and absence of regioselectivity dilemma.展开更多
Corrosion engineering is an effective way to improve the oxygen evolution reaction(OER)activity of al-loys.However,the impact of grain boundary corrosion on the structure and electrochemical performance of alloy is st...Corrosion engineering is an effective way to improve the oxygen evolution reaction(OER)activity of al-loys.However,the impact of grain boundary corrosion on the structure and electrochemical performance of alloy is still unknown.Herein,the vacuum arc-melted CrCoNiFe alloys with interlaced network struc-tures via grain boundary corrosion methods were fabricated.The grain boundaries that existed as de-fects were severely corroded and an interlaced network structure was formed,promoting the exposure of the active site and the release of gas bubbles.Besides,the(oxy)hydroxides layer(25 nm)on the sur-face could act as the true active center and improve the surface wettability.Benefiting from the unique structure and constructed surface,the CrCoNiFe-12 affords a high urea oxidation reaction(UOR)perfor-mance with the lowest overpotential of 250 mV at 10 mA/cm^(2)in 1 M KOH adding 0.33 M urea.The CrCoNiFe-12||Pt only required a cell voltage of 1.485 V to afford 10 mA/cm^(2)for UOR and long-term sta-bility of 100 h at 10 mA/cm^(2)(27.6 mV decrease).These findings offer a facile strategy for designing bulk multiple-principal-element alloy electrodes for energy conversion.展开更多
NiFe(oxy)hydroxides nanosheets were synthesized on nickel foams via co-precipitation and electrochemical activation. It is found that the phosphate precursors(Na_(3)PO_(4), Na_(2)HPO_(4)and NaH_(2)PO_(4)) have diverse...NiFe(oxy)hydroxides nanosheets were synthesized on nickel foams via co-precipitation and electrochemical activation. It is found that the phosphate precursors(Na_(3)PO_(4), Na_(2)HPO_(4)and NaH_(2)PO_(4)) have diverse effects on the morphology and thus the oxygen evolution reaction activity of the formed final catalysts. The resulting NiFe(oxy)hydroxides nanosheets prepared with Na_(2)HPO_(4)demonstrate a low overpotential of 205 m V to achieve a current density of 50 mA/cm^(2) with a Tafel slope down to 30 mV/dec in 1 mol/L KOH, and remain stable for 20 h during stability test.展开更多
Developing highly active and cost-effective electrocatalysts for enhancing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a significant challenge for overall water splitting.Sulfur-incorporat...Developing highly active and cost-effective electrocatalysts for enhancing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a significant challenge for overall water splitting.Sulfur-incorporated nickel iron(oxy)hydroxide(S-NiFeOOH)nanosheets were directly grown on commercial nickel foam using a galvanic corrosion method and a hydrothermal method.The incorporation of sulfur into NiFeOOH enhanced the catalytic activity for the HER and OER in 1 M KOH electrolyte.The enhanced catalytic activity is attributed to the change in the local structure and chemical states due to the incorporation of sulfur.High performance for overall water splitting was achieved with an alkaline water electrolyzer.This was realized by employing S-NiFeOOH as a bifunctional electrocatalyst,thereby outperforming a water electrolyzer that requires the usage of precious metal electrocatalysts(i.e.,Pt/C as the HER electrocatalyst and IrO_(2) as the OER electrocatalyst).Moreover,when driven by a commercial silicon solar cell,an alkaline water electrolyzer that uses S-NiFeOOH as a bifunctional electrocatalyst generated hydrogen under natural illumination.This study shows that S-NiFeOOH is a promising candidate for a large-scale industrial implementation of hydrogen production for overall water splitting because of its low cost,high activity,and durability.In addition,the solar-driven water electrolyzer using S-NiFeOOH as a bifunctional electrocatalyst affords the opportunity for developing effective and feasible solar power systems in the future.展开更多
The title compound N-（（3-（2-nitrophenyl） propanoyl）oxy）-N-phenylbenzamide（C22H18N2O5,Mr = 390.38） was synthesized with nitrobenzene as the starting materials and structurally characterized by 1H NMR,13 C NMR,I...The title compound N-（（3-（2-nitrophenyl） propanoyl）oxy）-N-phenylbenzamide（C22H18N2O5,Mr = 390.38） was synthesized with nitrobenzene as the starting materials and structurally characterized by 1H NMR,13 C NMR,IR,H RMS（E-SI） and single-crystal X-ray diffraction.The crystalline structure of the title compound was studied in detail.The single-crystal X-ray diffraction revealed that the compound crystallizes in monoclinic,space group P21/n,with a = 14.4481（7）,b = 8.0089（5）,c = 16.6808（9） A,α = 90.00（5）,β = 100.069（5）,γ = 90.00（5）°,Mr = 390.38,V = 1900.46（18） A^3,Z = 4,Dc = 1.364 g/cm^-3,μ = 0.098,F（000） = 816.0,the final R = 0.0530 and w R = 0.1141 for 2525 observed reflections（I 〉 2σ（I））,R（all data） = 0.0813,w R（all data） = 0.1335,completeness to theta of 26.020 is 99.8% and GOF = 1.085.The crystal structure contains three branched chains with its center placed at the midpoint of N.The phenyl ring（C（8）~C（13）） makes a dihedral angle of 83.5（1） ℃ with the phenyl ring（C（1）~C（6））,and 80.5（1） ℃with the nitro-substituted benzene ring（C（17）~C（22））,indicating that the three rings are not coplanar.Hydrogen bonds（C（10）–H（10）···O（3））,（C（15）–H（15B）···O（4） and C（16）–H（16B）···O（4）） together with π-π stacking interactions stabilize the structure of the molecule.The preliminary biological test shows that the title compound has good antitumor activity against A549 in vitro with the IC50 value of 3.17 μmol.展开更多
In this work,a facile chelation-mediated route was developed to fabricate ultrathin cobalt(oxy)hydroxides(CoOOH)nanosheets on hematite photoanode(Fe_(2)O_(3)).The route contains two steps of the adsorption of[Co-EDTA]...In this work,a facile chelation-mediated route was developed to fabricate ultrathin cobalt(oxy)hydroxides(CoOOH)nanosheets on hematite photoanode(Fe_(2)O_(3)).The route contains two steps of the adsorption of[Co-EDTA]^(2-)species on Fe_(2)O_(3) nanorod array followed by the hydrolysis in alkaline solution.The resulting CoOOH/Fe_(2)O_(3) exhibits a remarkably improved photocurrent density of 2.10 mA cm^(-2) at 1.23 V vs.RHE,which is ca.2.8 times that of bare Fe_(2)O_(3).In addition,a negative shift of onset potential ca.200 mV is achieved.The structural characterizations reveal the chelate EDTA plays important roles that enhance the adsorption of Co species and the formation of contact between CoOOH and Fe_(2)O_(3).(Photo)electrochemical analysis suggests,besides providing active sites for water oxidation,CoOOH at large extent promotes the charge separation and the charge transfer via passivating surface states and suppressing charge recombination.It also found CoOOH possesses some oxygen vacancies,which could act as trapping centers for photogenerated holes and facilitate the charge separation.Intensity modulated photocurrent spectroscopy(IMPS)shows that,under low applied potential the water oxidation mainly occurs on CoOOH,while under high applied potential the water oxidation could occur on both CoOOH and Fe_(2)O_(3).The findings not only provide an efficient strategy for designing ultrathin(oxy)hydroxides on semiconductors for PEC applications but also put forward a new insight on the role of CoOOH during water oxidation.展开更多
Oxy fuel combustion and conventional cycle(currently working cycle) in Kazeroon plant are modeled using commercial thermodynamic modeling software. Economic evaluation of the two models regarding the resources of tran...Oxy fuel combustion and conventional cycle(currently working cycle) in Kazeroon plant are modeled using commercial thermodynamic modeling software. Economic evaluation of the two models regarding the resources of transport and injection of carbon dioxide into oil fields at Gachsaran for enhanced oil recovery in the various oil price indices is conducted and indices net present value(NPV) and internal rate of return on investment(IRR) are calculated. The results of the two models reveal that gross efficiency of the oxy fuel cycle is more than reference cycle(62% compared to 49.03%), but the net efficiency is less(41.85% compared to 47.92%) because of the high-energy consumption of the components, particularly air separation unit(ASU) in the oxy fuel cycle. In this model, pure carbon dioxide with pressure of 20×105 Pa and purity of 96.84% was captured. NOX emissions also decrease by 4289.7 tons per year due to separation of nitrogen in ASU. In this model, none of the components of oxy fuel cycle is a major engineering challenge. With increasing oil price, economic justification of oxy fuel combustion model increases. With the price of oil at $ 80 per barrel in mind and $ 31 per ton fines for emissions of carbon dioxide in the atmosphere, IRR is the same for both models.展开更多
Single crystals of two 1,3-phenylenebis（oxy）diacetic acid（C10H10O8） compounds 1 and 2 were obtained via slow evaporation.The compounds were characterized by elemental analysis,IR and single-crystal X-ray diffracti...Single crystals of two 1,3-phenylenebis（oxy）diacetic acid（C10H10O8） compounds 1 and 2 were obtained via slow evaporation.The compounds were characterized by elemental analysis,IR and single-crystal X-ray diffraction.Compound 1（C10H14O8） crystallizes in the triclinic system,space group P1 with a = 6.3751（6）,b = 8.5311（8）,c = 11.4510（11）A,α = 93.3650（10）,β = 105.3190（10）,γ = 97.2140（10）°,V = 593.15（10） A^3,Z = 2,Mr = 262.21,Dc = 1.468 g/cm^3,F（000） = 276,GOOF = 1.005,° = 0.129 mm^-1,the final R = 0.0361 and w R = 0.0802 for 1854 observed reflections with I 〉 2σ（I）.Compound 2（C30H28N2O12） crystallizes in the triclinic system,space group P1 with a = 9.7416（13）,b = 11.839（2）,c = 12.9828（13） A,α = 74.191（4）,β = 77.953（2）,γ = 74.726（3）°,V = 1374.5（3） A^3,Z = 2,Mr = 608.54,Dc = 1.470 g/cm^3,F（000） = 636,GOOF = 1.061,° = 0.115 mm^-1,the final R = 0.0500 and w R = 0.1221 for 3966 observed reflections with I 〉 2σ（I）.Both compounds 1 and 2 exhibit 3D supramolecular structures under hydrogen bonding interactions.The results of preliminary antibacterial activity show that the title compounds display moderate antibacterial activities against the tested gram positive bacteria（S.aureus,C.albicans and B.subtilis） and gram negative bacteria（E.coli and P.aeruginosa）.展开更多
The contraction of isolated rat and rabbit uteri induced by oxytocin and PGF2α was markedly inhibited by chlorpheniramine (Chl) and astemizolum (Ast) , both of which also decreased the resting tension of uteri, and t...The contraction of isolated rat and rabbit uteri induced by oxytocin and PGF2α was markedly inhibited by chlorpheniramine (Chl) and astemizolum (Ast) , both of which also decreased the resting tension of uteri, and their spontaneous contraction. The inhibitory effects of both drugs were dose-dependent. At high concentrations , Chl 7. 4 × 10-4 mol/L and Ast 10-4 mol/L could counteract the contraction of the uteri induced by Oxy and PGF2α, and their spontaneous contraction as well. They decreased the resting tension to the lower level. The mechanism of their non-special relaxed action on uteri could not be completely explained only by their H1-receptor blocking action. Whether they act by blocking calcium channel or by inhibiting calmodulin (CaM) remains to be further explored.展开更多
The inversion reaction of hydroxy lamine was investigated by using the ab initiointrinsic reaction coordinate(IRC)method with 4-31G basis set.Our results indicate that the ∠H_1NO changes arastically in the vicinity o...The inversion reaction of hydroxy lamine was investigated by using the ab initiointrinsic reaction coordinate(IRC)method with 4-31G basis set.Our results indicate that the ∠H_1NO changes arastically in the vicinity of the transition state while the other bo-nd angles and bond lengths change little throughout the reaction process.展开更多
The compound N-phenyl-N-[（o-nitrophenylacetyl）oxy]benzamide （C21HI6N2Os, Mr = 376） has been synthesized by the reaction of N-hydroxy-N-phenylbenzamide with 2-（2-nitro- phenyl）acetyl chloride in dichlorom-ethane ...The compound N-phenyl-N-[（o-nitrophenylacetyl）oxy]benzamide （C21HI6N2Os, Mr = 376） has been synthesized by the reaction of N-hydroxy-N-phenylbenzamide with 2-（2-nitro- phenyl）acetyl chloride in dichlorom-ethane and its structure Was characterized by 1H NMR, 13C NMR, IR, H RMS（ESI） and single-crystal X-ray diffraction. The crystal of the title compound belongs to monoclinic, space group C2/c with a = 32.30（2）, b = 8.400（5）, c = 15.099（9） A, fl = 114.256（10）°, V = 3735（4） A3, Z = 8, D, = 1.339 g/cm3, F（000） = 1568, p = 0.097 mm-1, the final R = 0.0506 and wR = 0.1176 for 2318 observed reflections （1 〉 2a（/））. The title molecule contains three branched chains with its center placed at the midpoint of N. The phenyl ring （C（1）＇-C（6）） makes a dihedral angle of 70.3（1）° with the phenyl ring （C（10）-C（15）） of benzoyl group, and 14.3（1）° with the phenyl ring （C（16） - C（21））, Hydrogen bonds C（5）-H（5）...O（1） and C（12）-H（12）...O（3） together with it-Jr stacking interactions contribute to the stability of the structure.展开更多
New compounds were synthesized,which belong to 3 types of pyrimidinyl(triazinyl)oxy substituted carboxylic derivatives respectively.In bioassay,the effects of the structural factors on the herbicidal activity were inv...New compounds were synthesized,which belong to 3 types of pyrimidinyl(triazinyl)oxy substituted carboxylic derivatives respectively.In bioassay,the effects of the structural factors on the herbicidal activity were investigated,in which the stereochemistry has a strong influence on the activity.展开更多
An unusual formal oxy transposition of vinylogous β-silyloxy-cyclobutanone 1（a 1,5-difunctionalized substrate） under mild acidic conditions（aqueous HF in CH3CN at 0℃） to the decalinic y-lactone 2 was described.A...An unusual formal oxy transposition of vinylogous β-silyloxy-cyclobutanone 1（a 1,5-difunctionalized substrate） under mild acidic conditions（aqueous HF in CH3CN at 0℃） to the decalinic y-lactone 2 was described.A plausible mechanistic pathway involving the Grob-type fragmentation and intramolecularγ-Iactonization was proposed.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51822106 and 52002318).
文摘NiFe(oxy)hydroxide(NiFeOOH)has been widely studied as a catalyst for oxygen evolution reaction(OER),but its activity is still not satisfactory.Although metal doping has been employed as a promising strategy for addressing this issue,the instability and leaching of the high-valence dopant metals remain considerable challenges.Herein,an array of Cr-doped NiFeOOH nanosheets was in situ synthesized on nickel foam via a one-step hydrothermal method.The doping of NiFeOOH with Cr was found to induce partial electron transfer from Ni and Fe to Cr atoms,thereby modulating the electronic structure of the catalyst and enhancing its intrinsic activity.Electrochemical and in situ Raman spectroscopy analyses showed that Fe active sites with lower charge density enhance the adsorption of^(*) OH and reduce the formation energy barrier of the*OOH intermediate during OER,thereby accelerating the OER.Moreover,Fe was found to promote the transfer of additional electrons to Cr,leading to electron accumulation at Cr sites.This electron accumulation effectively prevents Cr from excessive oxidation and leaching under anode potentials,thereby maintaining the structural stability of the catalyst.The optimized Cr-doped NiFeOOH self-supported electrode exhibited a current density of 50 mA/cm^(2) with an overpotential of only 239 mV and remained stable for 100 h at 600 mA/cm^(2) in 1 mol/L KOH.
基金supported by the National Key Research and Development Program of China(No.2018YFA0703700)the National Natural Science Foundation of China(No.12034002)the Interdisciplinary Research Project for Young Teachers of USTB(Fundamental Research Funds for the Central Universities,No.FRF-IDRY-23-033)。
文摘Amorphous two-dimensional transition metal oxide/(oxy)hydroxide(2D TMO/TMHO)nanomaterials(NMs)have the properties of both 2D and amorphous materials,displaying outstanding physicochemical qualities.Therefore,they demonstrate considerable promise for use in electrocatalytic water splitting applications.Here,the primary amorphization strategies for achieving the 2D TMO/TMHO NMs are comprehensively reviewed,including low-temperature reaction,rapid reaction,exchange/doping effect,ligand modulation,and interfacial energy confinement.By integrating these strategies with various physicochemical synthesis methods,it is feasible to control the amorphization of TMO/TMHO NMs while maintaining the distinctive benefits of their 2D structures.Furthermore,it delves into the structural advantages of amorphous 2D TMO/TMHO NMs in electrocatalytic water splitting,particularly emphasizing recent advancements in enhancing their electrocatalytic performance through interface engineering.The challenges and potential future directions for the precise synthesis and practical application of amorphous 2D TMO/TMHO NMs are also provided.This review aims to establish a theoretical foundation and offer experimental instructions for developing effective and enduring electrocatalysts for water splitting.
文摘A more feasibly convergent synthesis of selective estrogen receptor degrading agent(S)-8-(4-((1-(3-fluoropropyl)-pyrrolidin-3-yl)oxy)phenyl)-7-(4-hydroxyphenyl)-5,6-dihydronaphthalen-2-ol was reported,featured with concise work up and absence of regioselectivity dilemma.
基金supported by the National Natu-ral Science Foundation of China(No.52102210)the Natural Sci-ence Foundation of Sichuan Province(Nos.2022NSFSC2005 and 2022NSFSC1255)+1 种基金the Opening Project of Key Laboratory of Op-toelectronic Chemical Materials and Devices of Ministry of Educa-tion,Jianghan University(No.JDGD-202218)Supplementary materials Supplementary material associated with this article can be found,in the online version,at doi:10.1016/j.jmst.2024.01.096.106。
文摘Corrosion engineering is an effective way to improve the oxygen evolution reaction(OER)activity of al-loys.However,the impact of grain boundary corrosion on the structure and electrochemical performance of alloy is still unknown.Herein,the vacuum arc-melted CrCoNiFe alloys with interlaced network struc-tures via grain boundary corrosion methods were fabricated.The grain boundaries that existed as de-fects were severely corroded and an interlaced network structure was formed,promoting the exposure of the active site and the release of gas bubbles.Besides,the(oxy)hydroxides layer(25 nm)on the sur-face could act as the true active center and improve the surface wettability.Benefiting from the unique structure and constructed surface,the CrCoNiFe-12 affords a high urea oxidation reaction(UOR)perfor-mance with the lowest overpotential of 250 mV at 10 mA/cm^(2)in 1 M KOH adding 0.33 M urea.The CrCoNiFe-12||Pt only required a cell voltage of 1.485 V to afford 10 mA/cm^(2)for UOR and long-term sta-bility of 100 h at 10 mA/cm^(2)(27.6 mV decrease).These findings offer a facile strategy for designing bulk multiple-principal-element alloy electrodes for energy conversion.
基金supported by the National Natural Science Foundation of China (Nos. 11904411, 52072308)the Fundamental Research Funds for the Central Universities, China (Nos. 3102021MS0404, 3102019JC001)。
文摘NiFe(oxy)hydroxides nanosheets were synthesized on nickel foams via co-precipitation and electrochemical activation. It is found that the phosphate precursors(Na_(3)PO_(4), Na_(2)HPO_(4)and NaH_(2)PO_(4)) have diverse effects on the morphology and thus the oxygen evolution reaction activity of the formed final catalysts. The resulting NiFe(oxy)hydroxides nanosheets prepared with Na_(2)HPO_(4)demonstrate a low overpotential of 205 m V to achieve a current density of 50 mA/cm^(2) with a Tafel slope down to 30 mV/dec in 1 mol/L KOH, and remain stable for 20 h during stability test.
基金supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.NRF-2016R1D1A3B04935101).
文摘Developing highly active and cost-effective electrocatalysts for enhancing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a significant challenge for overall water splitting.Sulfur-incorporated nickel iron(oxy)hydroxide(S-NiFeOOH)nanosheets were directly grown on commercial nickel foam using a galvanic corrosion method and a hydrothermal method.The incorporation of sulfur into NiFeOOH enhanced the catalytic activity for the HER and OER in 1 M KOH electrolyte.The enhanced catalytic activity is attributed to the change in the local structure and chemical states due to the incorporation of sulfur.High performance for overall water splitting was achieved with an alkaline water electrolyzer.This was realized by employing S-NiFeOOH as a bifunctional electrocatalyst,thereby outperforming a water electrolyzer that requires the usage of precious metal electrocatalysts(i.e.,Pt/C as the HER electrocatalyst and IrO_(2) as the OER electrocatalyst).Moreover,when driven by a commercial silicon solar cell,an alkaline water electrolyzer that uses S-NiFeOOH as a bifunctional electrocatalyst generated hydrogen under natural illumination.This study shows that S-NiFeOOH is a promising candidate for a large-scale industrial implementation of hydrogen production for overall water splitting because of its low cost,high activity,and durability.In addition,the solar-driven water electrolyzer using S-NiFeOOH as a bifunctional electrocatalyst affords the opportunity for developing effective and feasible solar power systems in the future.
基金Supported by the Lanzhou Science and Technology Bureau Program Funds(2013-4-79,2014-1-174,2014-1-214)
文摘The title compound N-（（3-（2-nitrophenyl） propanoyl）oxy）-N-phenylbenzamide（C22H18N2O5,Mr = 390.38） was synthesized with nitrobenzene as the starting materials and structurally characterized by 1H NMR,13 C NMR,IR,H RMS（E-SI） and single-crystal X-ray diffraction.The crystalline structure of the title compound was studied in detail.The single-crystal X-ray diffraction revealed that the compound crystallizes in monoclinic,space group P21/n,with a = 14.4481（7）,b = 8.0089（5）,c = 16.6808（9） A,α = 90.00（5）,β = 100.069（5）,γ = 90.00（5）°,Mr = 390.38,V = 1900.46（18） A^3,Z = 4,Dc = 1.364 g/cm^-3,μ = 0.098,F（000） = 816.0,the final R = 0.0530 and w R = 0.1141 for 2525 observed reflections（I 〉 2σ（I））,R（all data） = 0.0813,w R（all data） = 0.1335,completeness to theta of 26.020 is 99.8% and GOF = 1.085.The crystal structure contains three branched chains with its center placed at the midpoint of N.The phenyl ring（C（8）~C（13）） makes a dihedral angle of 83.5（1） ℃ with the phenyl ring（C（1）~C（6））,and 80.5（1） ℃with the nitro-substituted benzene ring（C（17）~C（22））,indicating that the three rings are not coplanar.Hydrogen bonds（C（10）–H（10）···O（3））,（C（15）–H（15B）···O（4） and C（16）–H（16B）···O（4）） together with π-π stacking interactions stabilize the structure of the molecule.The preliminary biological test shows that the title compound has good antitumor activity against A549 in vitro with the IC50 value of 3.17 μmol.
基金supported by the National Natural Science Foundation of China(51502078)the Major Project of Science and Technology,Education Department of Henan Province(19A150019 and 19A150018)+2 种基金the Science and Technology Research Project of Henan Province(192102310490 and 182102410090)the program for Science&Technology Innovation Team in Universities of Henan Province(19IRTSTHN029)supported by the U.S.Department of Energy,Office of Science,Office of Basic Energy Sciences,Chemical Sciences,Geosciences,and Biosciences Division,Catalysis Science program。
文摘In this work,a facile chelation-mediated route was developed to fabricate ultrathin cobalt(oxy)hydroxides(CoOOH)nanosheets on hematite photoanode(Fe_(2)O_(3)).The route contains two steps of the adsorption of[Co-EDTA]^(2-)species on Fe_(2)O_(3) nanorod array followed by the hydrolysis in alkaline solution.The resulting CoOOH/Fe_(2)O_(3) exhibits a remarkably improved photocurrent density of 2.10 mA cm^(-2) at 1.23 V vs.RHE,which is ca.2.8 times that of bare Fe_(2)O_(3).In addition,a negative shift of onset potential ca.200 mV is achieved.The structural characterizations reveal the chelate EDTA plays important roles that enhance the adsorption of Co species and the formation of contact between CoOOH and Fe_(2)O_(3).(Photo)electrochemical analysis suggests,besides providing active sites for water oxidation,CoOOH at large extent promotes the charge separation and the charge transfer via passivating surface states and suppressing charge recombination.It also found CoOOH possesses some oxygen vacancies,which could act as trapping centers for photogenerated holes and facilitate the charge separation.Intensity modulated photocurrent spectroscopy(IMPS)shows that,under low applied potential the water oxidation mainly occurs on CoOOH,while under high applied potential the water oxidation could occur on both CoOOH and Fe_(2)O_(3).The findings not only provide an efficient strategy for designing ultrathin(oxy)hydroxides on semiconductors for PEC applications but also put forward a new insight on the role of CoOOH during water oxidation.
文摘Oxy fuel combustion and conventional cycle(currently working cycle) in Kazeroon plant are modeled using commercial thermodynamic modeling software. Economic evaluation of the two models regarding the resources of transport and injection of carbon dioxide into oil fields at Gachsaran for enhanced oil recovery in the various oil price indices is conducted and indices net present value(NPV) and internal rate of return on investment(IRR) are calculated. The results of the two models reveal that gross efficiency of the oxy fuel cycle is more than reference cycle(62% compared to 49.03%), but the net efficiency is less(41.85% compared to 47.92%) because of the high-energy consumption of the components, particularly air separation unit(ASU) in the oxy fuel cycle. In this model, pure carbon dioxide with pressure of 20×105 Pa and purity of 96.84% was captured. NOX emissions also decrease by 4289.7 tons per year due to separation of nitrogen in ASU. In this model, none of the components of oxy fuel cycle is a major engineering challenge. With increasing oil price, economic justification of oxy fuel combustion model increases. With the price of oil at $ 80 per barrel in mind and $ 31 per ton fines for emissions of carbon dioxide in the atmosphere, IRR is the same for both models.
基金Supported by the National Natural Science Foundation of China(No.21264011,20961007)the Aviation Fund(No.2014ZF56020)
文摘Single crystals of two 1,3-phenylenebis（oxy）diacetic acid（C10H10O8） compounds 1 and 2 were obtained via slow evaporation.The compounds were characterized by elemental analysis,IR and single-crystal X-ray diffraction.Compound 1（C10H14O8） crystallizes in the triclinic system,space group P1 with a = 6.3751（6）,b = 8.5311（8）,c = 11.4510（11）A,α = 93.3650（10）,β = 105.3190（10）,γ = 97.2140（10）°,V = 593.15（10） A^3,Z = 2,Mr = 262.21,Dc = 1.468 g/cm^3,F（000） = 276,GOOF = 1.005,° = 0.129 mm^-1,the final R = 0.0361 and w R = 0.0802 for 1854 observed reflections with I 〉 2σ（I）.Compound 2（C30H28N2O12） crystallizes in the triclinic system,space group P1 with a = 9.7416（13）,b = 11.839（2）,c = 12.9828（13） A,α = 74.191（4）,β = 77.953（2）,γ = 74.726（3）°,V = 1374.5（3） A^3,Z = 2,Mr = 608.54,Dc = 1.470 g/cm^3,F（000） = 636,GOOF = 1.061,° = 0.115 mm^-1,the final R = 0.0500 and w R = 0.1221 for 3966 observed reflections with I 〉 2σ（I）.Both compounds 1 and 2 exhibit 3D supramolecular structures under hydrogen bonding interactions.The results of preliminary antibacterial activity show that the title compounds display moderate antibacterial activities against the tested gram positive bacteria（S.aureus,C.albicans and B.subtilis） and gram negative bacteria（E.coli and P.aeruginosa）.
文摘The contraction of isolated rat and rabbit uteri induced by oxytocin and PGF2α was markedly inhibited by chlorpheniramine (Chl) and astemizolum (Ast) , both of which also decreased the resting tension of uteri, and their spontaneous contraction. The inhibitory effects of both drugs were dose-dependent. At high concentrations , Chl 7. 4 × 10-4 mol/L and Ast 10-4 mol/L could counteract the contraction of the uteri induced by Oxy and PGF2α, and their spontaneous contraction as well. They decreased the resting tension to the lower level. The mechanism of their non-special relaxed action on uteri could not be completely explained only by their H1-receptor blocking action. Whether they act by blocking calcium channel or by inhibiting calmodulin (CaM) remains to be further explored.
文摘The inversion reaction of hydroxy lamine was investigated by using the ab initiointrinsic reaction coordinate(IRC)method with 4-31G basis set.Our results indicate that the ∠H_1NO changes arastically in the vicinity of the transition state while the other bo-nd angles and bond lengths change little throughout the reaction process.
基金supported by the Fundamental Research Funds for the Central Universities(lzujbky-2010-137)
文摘The compound N-phenyl-N-[（o-nitrophenylacetyl）oxy]benzamide （C21HI6N2Os, Mr = 376） has been synthesized by the reaction of N-hydroxy-N-phenylbenzamide with 2-（2-nitro- phenyl）acetyl chloride in dichlorom-ethane and its structure Was characterized by 1H NMR, 13C NMR, IR, H RMS（ESI） and single-crystal X-ray diffraction. The crystal of the title compound belongs to monoclinic, space group C2/c with a = 32.30（2）, b = 8.400（5）, c = 15.099（9） A, fl = 114.256（10）°, V = 3735（4） A3, Z = 8, D, = 1.339 g/cm3, F（000） = 1568, p = 0.097 mm-1, the final R = 0.0506 and wR = 0.1176 for 2318 observed reflections （1 〉 2a（/））. The title molecule contains three branched chains with its center placed at the midpoint of N. The phenyl ring （C（1）＇-C（6）） makes a dihedral angle of 70.3（1）° with the phenyl ring （C（10）-C（15）） of benzoyl group, and 14.3（1）° with the phenyl ring （C（16） - C（21））, Hydrogen bonds C（5）-H（5）...O（1） and C（12）-H（12）...O（3） together with it-Jr stacking interactions contribute to the stability of the structure.
文摘New compounds were synthesized,which belong to 3 types of pyrimidinyl(triazinyl)oxy substituted carboxylic derivatives respectively.In bioassay,the effects of the structural factors on the herbicidal activity were investigated,in which the stereochemistry has a strong influence on the activity.
基金financial support from National Natural Science Foundation of China(NSFC,Nos.21302177,21672049 and 21672030)
文摘An unusual formal oxy transposition of vinylogous β-silyloxy-cyclobutanone 1（a 1,5-difunctionalized substrate） under mild acidic conditions（aqueous HF in CH3CN at 0℃） to the decalinic y-lactone 2 was described.A plausible mechanistic pathway involving the Grob-type fragmentation and intramolecularγ-Iactonization was proposed.
