[Ru (bpy)_3]^(2+)/MCM-41 composite material obtained by loading tris(2, 2' - bipyridine)ruthenium(Ⅱ) ([Ru (bpy)_3]^(2+) ) in siliceous mesoporous MCM-41 was characterized by X-ray powder diffraction, UV-Vis absor...[Ru (bpy)_3]^(2+)/MCM-41 composite material obtained by loading tris(2, 2' - bipyridine)ruthenium(Ⅱ) ([Ru (bpy)_3]^(2+) ) in siliceous mesoporous MCM-41 was characterized by X-ray powder diffraction, UV-Vis absorption and emission spectroscopies. The absorption spectrum of [Ru(bpy)_3]^(2+) /MCM-41 is similar to that of [Ru (bpy)_3]^(2+) aqueous solution, whereas its emission spectrum exhibits hypsochromic shift compared to the solution spectrum. On the other hand, the peak position of the emission spectrum of [Ru(bpy)_3]^(2+)/MCM-41 shifts towards longer wavelength when the loading amount increases.展开更多
A commercially available chelating polymer, polystyrene tris(2-aminoethyl)amine, was used for the removal of chromium from aqueous solution. The influence of pH, contact time, adsorbent dosage and initial Cr (VI) conc...A commercially available chelating polymer, polystyrene tris(2-aminoethyl)amine, was used for the removal of chromium from aqueous solution. The influence of pH, contact time, adsorbent dosage and initial Cr (VI) concentration on adsorption was studied. The optimum pH for the removal of Cr (VI) was at pH 5, while optimum contact time and adsorbent dosage were 120 minutes and 10 g/L, respectively. Total chromium and Cr (VI) concentrations were analyzed by ICP-MS and UV-Visible. Adsorption isotherms using Langmuir and Freundlich isotherm models revealed that the data fitted Langmuir isotherm model better than Freundlich with a maximum adsorption capacity of 312.27 mg/g. FTIR spectroscopy, Scanning electron microscopy (SEM) and Energy Dispersive Spectrometry (EDS) analyses were performed on the adsorbent before and after binding Cr (VI). All analyses confirmed the complexation of Cr (VI) to the adsorbent. Desorption experiments using KCl solution indicated 89.3% release of chromium, rendering this method of high potential for adsorbent regeneration.展开更多
Recently, many attempts have been made to use carbon nanotubes in analytical chemistry, especially in adsorption of heavy metal ions from water. In this study, multiwalled carbon nanotubes (MWCNTs) were functionalized...Recently, many attempts have been made to use carbon nanotubes in analytical chemistry, especially in adsorption of heavy metal ions from water. In this study, multiwalled carbon nanotubes (MWCNTs) were functionalized with tris(2-aminoethyl) amine. The functionalized nanoparticles were characterized using Fourier transform infrared (FTIR), thermal gravimetric analyzer (TGA), elemental analysis, and Raman spectroscopy. The results revealed that the functionalization reaction was successfully accomplished. Lead adsorption from water was carried out using functionalized MWCNTs and measured by flame atomic absorption spectrometry (FAAS). The effects of pH, shaking time, initial metal ion concentration, and adsorbent dosage on the adsorption process were studied via batch method. The results obtained showed that removal of lead ions strongly depended on the pH. Desorption study revealed that lead ions adsorbed on the functionalized MWCNTs could be desorbed at pH 3 due to breakage of complexes formed on the sorbent surface. Maximum adsorption capacity of the sorbent under the optimal conditions was 43 mg/g. This favorable adsorption capacity suggests that functionalized carbon nanotubes can be applied for removal of lead from water solutions. The data obtained were fitted with the Langmuir and Freundlich isotherm adsorption models and Langmuir model showed better agreement with the experimental data.展开更多
In this work, a tris(2-aminoethyl)aminodicaboxylate functionality was substituted for the chloride of polyvinyl-benzyl chloride (PVBC) which was lightly cross-linked (2%) with divinyl benzene. The resulting derivatize...In this work, a tris(2-aminoethyl)aminodicaboxylate functionality was substituted for the chloride of polyvinyl-benzyl chloride (PVBC) which was lightly cross-linked (2%) with divinyl benzene. The resulting derivatized polymer microspheres were embedded in a hydrogel matrix of poly vinyl alcohol cross-linked with glutaraldehyde to produce a sensing membrane. The latter responded selectively to Cu2+ solutions of different concentration ranges (1 × 10-4 M to 1 × 10-6 M). The response is based on the interaction between the metal cations and the negatively charged deprotonated dicarboxylate functional group, which led to neutralization of the charges. As a result, an increase in the turbidity of the sensing membrane occurred which is attributed to a change in the refractive index of the derivatized polymer microspheres relative to that of the hydrogel. The change in the turbidity of the sensing membrane was measured as absorbance using a conventional spectrophotometer. It was found that Cu2+ ions bind to the aminodicarboxylated-polymer with a formation constant, Kf, of 1 × 105 M-1. SEM, Eds and IR analyses were performed on the aminodicarboxylated microspheres and their Cu2+ complex.展开更多
Tri(2-chloroethyl) phosphate(TCEP) with the initial concentration of 5 mg/L was degraded by UV/H2O2 oxidation process. The removal rate of TCEP in the UV/H2O2 system was 89.1% with the production of Cl-and PO4^3- of 0...Tri(2-chloroethyl) phosphate(TCEP) with the initial concentration of 5 mg/L was degraded by UV/H2O2 oxidation process. The removal rate of TCEP in the UV/H2O2 system was 89.1% with the production of Cl-and PO4^3- of 0.23 and 0.64 mg/L. The removal rate of total organic carbon of the reaction was 48.8% and the pH reached 3.3 after the reaction. The oxidative degradation process of TCEP in the UV/H2O2 system obeyed the first order kinetic reaction with the apparent rate constant of 0.0025 min^-1( R^2 = 0.9788). The intermediate products were isolated and identified by gas chromatography-mass spectrometer. The addition reaction of HO · and H2O and the oxidation reaction with H2O2 were found during the degradation pathway of 5 mg/L TCEP in the UV/H2O2 system. For the first time, environment risk was estimated via the "ecological structure activity relationships" program and acute and chronic toxicity changes of intermediate products were pointed out. The luminescence inhibition rate of photobacterium was used to evaluate the acute toxicity of intermediate products. The results showed that the toxicity of the intermediate products increased with the increase of reaction time, which may be due to the production of chlorine compounds. Some measures should be introduced to the UV/H2O2 system to remove the highly toxic Cl-containing compounds, such as a nanofiltration or reverse osmosis unit.展开更多
Tri(2-chloropropyl)phosphate(TCPP)was an emerging contaminant of global concern because of its frequent occurrence,potential toxic effects,and persistence in the environment.Microbial degradation might be an efficient...Tri(2-chloropropyl)phosphate(TCPP)was an emerging contaminant of global concern because of its frequent occurrence,potential toxic effects,and persistence in the environment.Microbial degradation might be an efficient and safe removal method,but limited information was available.In this study,Providencia rettgeri was isolated from contaminated sediment and showed it could use TCPP as unique phosphorus source to promote growth,and decompose 34.7%of TCPP(1 mg/L)within 5 days.The microbial inoculation and the initial concentration of TCPP could affect the biodegradation efficient.Further study results indicated that TCPP decomposition by Providencia rettgeri was mainly via phosphoester bond hydrolysis,evidenced by the production of bis(2-chloropropyl)phosphate(C_(6)H_(13)Cl_(2)PO_(4))and mono-chloropropyl phosphate(C_(3)H_(8)ClPO_(4)).Both intracellular and extracellular enzymes could degrade TCPP,but intracellular degradation was dominant in the later reaction stage,and the presence of Cu^(2+) ions had a promoting effect.These findings developed novel insights into the potential mechanism of TCPP microbial degradation.展开更多
he reaction of (2, 4-C_7H_11)_3Nd with HC=CC_6H_5 in toluene leads to [(2, 4-C_7H_11)_2NdC = CC_6H_5]_2 , which crystallizes in the space group P_cab with unit cell pa-rameters a=1 . 0489 (11), b=1.8033 (12), c=2. 106...he reaction of (2, 4-C_7H_11)_3Nd with HC=CC_6H_5 in toluene leads to [(2, 4-C_7H_11)_2NdC = CC_6H_5]_2 , which crystallizes in the space group P_cab with unit cell pa-rameters a=1 . 0489 (11), b=1.8033 (12), c=2. 1064 (15)nm and Z=4 , least-squares refinement based on 2323 observed reflections converged to a final R valueof 0. 08. The molecular structure shows that the complex is a dimer, in which two(2,4-C_7H_11)_2Nd units are connected by asymmetrical alkynide bridges with indepen-dent Nd-C(alkynide) bond lengths of 0. 2552(25)and 0. 2560(24)nm, Nd-C=C angles of 124. 1(17)° and 134. 2(17)°.展开更多
Two tri(2-chlorobenzyl)tin(IV) complexes with dithiocarbamate ligands (2-Cl- C6H4CH2)3SnS2CN(C5H10) 1 and (2-Cl-C6H4CH2)3SnS2CN(C4H9N) 2 have been synthesized by the reaction of tri(2-chlorobenzyl)tin(IV) chloride wit...Two tri(2-chlorobenzyl)tin(IV) complexes with dithiocarbamate ligands (2-Cl- C6H4CH2)3SnS2CN(C5H10) 1 and (2-Cl-C6H4CH2)3SnS2CN(C4H9N) 2 have been synthesized by the reaction of tri(2-chlorobenzyl)tin(IV) chloride with dithiocarbamates and characterized by elemental analysis, IR and 1H NMR. The crystal structures were determined by X-ray single-crystal diffraction. The crystal of complex 1 belongs to triclinic, space group P with a = 9.121(5), b = 10.788(6), c = 15.549(8) ? a = 77.812(6), b = 88.279(8), g = 72.023(6)o, Z = 2, V = 1421.5(13) ?, Dc = 1.532 g/cm3, ?= 1.344 mm-1, F(000) = 660, R = 0.0382 and wR = 0.0984; and that of complex 2 is of monoclinic, space group P21/n with a = 13.892(10), b = 2.1274(8), c = 2.0553(15) ? b = 107.145(11)o, Z = 4, V = 2726(3) ?, Dc = 1.600 g/cm3, ?= 1.403 mm-1, F(000) = 1320, R = 0.0361 and wR = 0.0826. Their structures show a distorted trigonal bipyramidal configuration with five- coordination for the central tin atoms.展开更多
A novel methacrylate monomer with bulky side group, tri(2-pyridyl)methyl methacrylate (Tr2PyMA), was synthesized and polymerized. The polymer obtained by radical polymerization exhibits high isotactic tacticity.
The semiconductor manufacturing industry imposes stringent requirements on the metal ion content of photoresist resin monomers.Tris(2-carboxyethyl)isocyanurate(H_(3)tci),a critical raw material for photoresist resin m...The semiconductor manufacturing industry imposes stringent requirements on the metal ion content of photoresist resin monomers.Tris(2-carboxyethyl)isocyanurate(H_(3)tci),a critical raw material for photoresist resin monomers,inevitably incorporates metal ions during production.However,its inherent carboxyethyl groups form stable coordination complexes with Cr(Ⅲ),hindering the semiconductor-grade resin monomer production.To achieve the ultra-deep removal of Cr(Ⅲ)at ultra-trace concentrations,inspired by the hard–soft-acid–base theory,we systematically modulated the electron-rich sulfonic acid group on polymers via controlled sulfonation conditions to achieve a novel series of adsorption materials(St)with ultra-high Cr(Ⅲ)adsorption affinity.The adsorption–recrystallization process using 6 g of St-V-15 could reduce the Cr(Ⅲ)concentration in a solution containing 1 g of H_(3)tci from 840 ppb to 27.5 ppb.Furthermore,St-V-15 exhibited a maximum adsorption capacity of 145 mg g^(−1)calculated using the Langmuir model and a rapid initial adsorption rate of 82.92 mg g^(−1)min^(−1)at 333 K.Additionally,St-V-15 demonstrated exceptional selectivity for Cr(Ⅲ)over competing ions(e.g.,K(Ⅰ),Mg(Ⅱ),Na(Ⅰ)and Zn(Ⅱ))and maintained stable performance over at least 10 adsorption–desorption cycles.The superior performance originated from the chelation between Cr(Ⅲ)and the sites of O atoms(S–O and S=O)combined with the electrostatic interaction between deprotonated sulfonic acid groups and Cr(Ⅲ).These results position St-V-15 as a promising adsorption material for ultra-trace Cr(Ⅲ)removal in H_(3)tci,offering a cost-effective solution for semiconductor-grade resin monomer production for the very first time.展开更多
A mild one-step radical-to-radical synthetic strategy has been developed to directly produce a new family of diarylamine-substituted tris(2,4,6-trichlorophenyl)methyl(TTM)radicals TTM-DPA,TTM-DBPA,and TTM-DFA.The obta...A mild one-step radical-to-radical synthetic strategy has been developed to directly produce a new family of diarylamine-substituted tris(2,4,6-trichlorophenyl)methyl(TTM)radicals TTM-DPA,TTM-DBPA,and TTM-DFA.The obtained TTM radical derivatives are extremely stable during chromatography purification and long-term storage in the solid state.展开更多
Polyamine-based scavenger resins containing 2, 3 and 4 nitrogen atoms have been prepared and their comparative efficacy to scavenge appropriate electrophilic chemicals (acids, acid chlorides, isocyanates and aldehydes...Polyamine-based scavenger resins containing 2, 3 and 4 nitrogen atoms have been prepared and their comparative efficacy to scavenge appropriate electrophilic chemicals (acids, acid chlorides, isocyanates and aldehydes) from solutions has been studied. As expected, the scavenging efficiency is directly proportional to the number of nucleophic nitrogens present on the resin. The results have been compared with the performance of the popular scavenger resin, namely, tris(2-aminoethyl)amine resin, to conclude that the low-cost polyamine resins now prepared can be conveniently used as effectively as the expensive commercial product.展开更多
Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the infl...Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the influence of the aziridine bonding agents family on the propellant aging. Aging of the prepared propellant samples was conducted as follows: 1. Four samples, one free of bonding agents, and three containing aziridine based bonding agents MAPO,HX-752, MAT4 were aged at 65°C. 2. Another four samples based on HX-752, MAT4 with different curing agents were aged at 65°C. The measured mechanical properties of the free bonding agent propellant samples were very far from the specifications and this illustrates the importance of the bonding agents in both the preparation and the aging phases.The prepared bonding agent 'MAT4' gave remarkable improvements of the mechanical properties comparing with HX-752 and MAPO. The aziridine bonding agents family inhibited the rate of decomposition of the propellant during the aging periods and supported the propellant matrix against decomposition at the elevate temperatures. Using of HMDI as curing agent gave slight better mechanical properties to the IPDI.展开更多
The Furniture and Furnishings(Fire Safety)Regulations 1988 is the major driver for the use of chemical flame retardants(FRs)in soft furnishings marketed in the UK.While these regulations specify the level of flame ret...The Furniture and Furnishings(Fire Safety)Regulations 1988 is the major driver for the use of chemical flame retardants(FRs)in soft furnishings marketed in the UK.While these regulations specify the level of flame retardancy required,they do not specify how such levels should be achieved.Consequently,it remains unclear which FRs are present in UK soft furnishings.This is important not only to help assess what FRs we may be exposed to currently,but which FRs are currently entering the waste stream with concomitant potential for release into the environment.To address this data gap,concentrations of polybrominated diphenyl ethers(PBDEs),hexabromocyclododecane(HBCDD)and a range of chlorinated organophosphate flame retardants(OPFRs)were measured in samples of domestic and office waste soft furnishings products entering the UK waste stream in 2011 and 2012.This preliminary study measured the FR content of:carpets(n?4),curtains(n?7),mattress fabrics(n?2),furniture foam(n?9),and furniture upholstery textiles(n?10).Polybrominated diphenyl ethers(PBDEs)and hexabromocyclododecane(HBCDD)were not found at significant concentrations(below detection limits in most samples)in any of the twenty two analysed products.In contrast,7 of the 9 furniture foam samples were treated with tris(2-chloroisopropyl)phosphate(TCIPP)at a mean concentration of 1.9%w/w,with another single foam sample containing tris(1,3-dichloroisopropyl)phosphate(TDCIPP)and tris(2-chloroethyl)phosphate(TCEP)at 1.1 and 0.5%respectively.By comparison,PBDE concentrations are within the range reported previously for UK indoor dust[18],rather than the percent by weight levels required to impart flame retardancy.展开更多
基金the National Natural Science Foundation of China!(No. 29771013 and No. 29725101 )
文摘[Ru (bpy)_3]^(2+)/MCM-41 composite material obtained by loading tris(2, 2' - bipyridine)ruthenium(Ⅱ) ([Ru (bpy)_3]^(2+) ) in siliceous mesoporous MCM-41 was characterized by X-ray powder diffraction, UV-Vis absorption and emission spectroscopies. The absorption spectrum of [Ru(bpy)_3]^(2+) /MCM-41 is similar to that of [Ru (bpy)_3]^(2+) aqueous solution, whereas its emission spectrum exhibits hypsochromic shift compared to the solution spectrum. On the other hand, the peak position of the emission spectrum of [Ru(bpy)_3]^(2+)/MCM-41 shifts towards longer wavelength when the loading amount increases.
文摘A commercially available chelating polymer, polystyrene tris(2-aminoethyl)amine, was used for the removal of chromium from aqueous solution. The influence of pH, contact time, adsorbent dosage and initial Cr (VI) concentration on adsorption was studied. The optimum pH for the removal of Cr (VI) was at pH 5, while optimum contact time and adsorbent dosage were 120 minutes and 10 g/L, respectively. Total chromium and Cr (VI) concentrations were analyzed by ICP-MS and UV-Visible. Adsorption isotherms using Langmuir and Freundlich isotherm models revealed that the data fitted Langmuir isotherm model better than Freundlich with a maximum adsorption capacity of 312.27 mg/g. FTIR spectroscopy, Scanning electron microscopy (SEM) and Energy Dispersive Spectrometry (EDS) analyses were performed on the adsorbent before and after binding Cr (VI). All analyses confirmed the complexation of Cr (VI) to the adsorbent. Desorption experiments using KCl solution indicated 89.3% release of chromium, rendering this method of high potential for adsorbent regeneration.
文摘Recently, many attempts have been made to use carbon nanotubes in analytical chemistry, especially in adsorption of heavy metal ions from water. In this study, multiwalled carbon nanotubes (MWCNTs) were functionalized with tris(2-aminoethyl) amine. The functionalized nanoparticles were characterized using Fourier transform infrared (FTIR), thermal gravimetric analyzer (TGA), elemental analysis, and Raman spectroscopy. The results revealed that the functionalization reaction was successfully accomplished. Lead adsorption from water was carried out using functionalized MWCNTs and measured by flame atomic absorption spectrometry (FAAS). The effects of pH, shaking time, initial metal ion concentration, and adsorbent dosage on the adsorption process were studied via batch method. The results obtained showed that removal of lead ions strongly depended on the pH. Desorption study revealed that lead ions adsorbed on the functionalized MWCNTs could be desorbed at pH 3 due to breakage of complexes formed on the sorbent surface. Maximum adsorption capacity of the sorbent under the optimal conditions was 43 mg/g. This favorable adsorption capacity suggests that functionalized carbon nanotubes can be applied for removal of lead from water solutions. The data obtained were fitted with the Langmuir and Freundlich isotherm adsorption models and Langmuir model showed better agreement with the experimental data.
文摘In this work, a tris(2-aminoethyl)aminodicaboxylate functionality was substituted for the chloride of polyvinyl-benzyl chloride (PVBC) which was lightly cross-linked (2%) with divinyl benzene. The resulting derivatized polymer microspheres were embedded in a hydrogel matrix of poly vinyl alcohol cross-linked with glutaraldehyde to produce a sensing membrane. The latter responded selectively to Cu2+ solutions of different concentration ranges (1 × 10-4 M to 1 × 10-6 M). The response is based on the interaction between the metal cations and the negatively charged deprotonated dicarboxylate functional group, which led to neutralization of the charges. As a result, an increase in the turbidity of the sensing membrane occurred which is attributed to a change in the refractive index of the derivatized polymer microspheres relative to that of the hydrogel. The change in the turbidity of the sensing membrane was measured as absorbance using a conventional spectrophotometer. It was found that Cu2+ ions bind to the aminodicarboxylated-polymer with a formation constant, Kf, of 1 × 105 M-1. SEM, Eds and IR analyses were performed on the aminodicarboxylated microspheres and their Cu2+ complex.
基金supported by the National Nature Science Foundation of China (No. 21777067)the Primary Research&Development Plan of Jiangsu Province (No. BE2019679)+1 种基金Open Fund of National Key Laboratory of Collaborative Control and Remediation of Soil and Water Pollution for Environmental Protection (No. GHBK-001)the Open Fund of the State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,Northeast Normal University (No. 130028903)。
文摘Tri(2-chloroethyl) phosphate(TCEP) with the initial concentration of 5 mg/L was degraded by UV/H2O2 oxidation process. The removal rate of TCEP in the UV/H2O2 system was 89.1% with the production of Cl-and PO4^3- of 0.23 and 0.64 mg/L. The removal rate of total organic carbon of the reaction was 48.8% and the pH reached 3.3 after the reaction. The oxidative degradation process of TCEP in the UV/H2O2 system obeyed the first order kinetic reaction with the apparent rate constant of 0.0025 min^-1( R^2 = 0.9788). The intermediate products were isolated and identified by gas chromatography-mass spectrometer. The addition reaction of HO · and H2O and the oxidation reaction with H2O2 were found during the degradation pathway of 5 mg/L TCEP in the UV/H2O2 system. For the first time, environment risk was estimated via the "ecological structure activity relationships" program and acute and chronic toxicity changes of intermediate products were pointed out. The luminescence inhibition rate of photobacterium was used to evaluate the acute toxicity of intermediate products. The results showed that the toxicity of the intermediate products increased with the increase of reaction time, which may be due to the production of chlorine compounds. Some measures should be introduced to the UV/H2O2 system to remove the highly toxic Cl-containing compounds, such as a nanofiltration or reverse osmosis unit.
基金This work was supported by the Natural Science Foundation of Guangdong Province(No.2023A1515030284)the Key Realm Research and Development Program of Guangdong Province(No.2020B0202080001)+1 种基金the Guangdong Laboratory for Lingnan Modern Agriculture Project(No.NT2021010)the Science and Technology Planning Project of Guangdong Province(No.2021B1212040008).
文摘Tri(2-chloropropyl)phosphate(TCPP)was an emerging contaminant of global concern because of its frequent occurrence,potential toxic effects,and persistence in the environment.Microbial degradation might be an efficient and safe removal method,but limited information was available.In this study,Providencia rettgeri was isolated from contaminated sediment and showed it could use TCPP as unique phosphorus source to promote growth,and decompose 34.7%of TCPP(1 mg/L)within 5 days.The microbial inoculation and the initial concentration of TCPP could affect the biodegradation efficient.Further study results indicated that TCPP decomposition by Providencia rettgeri was mainly via phosphoester bond hydrolysis,evidenced by the production of bis(2-chloropropyl)phosphate(C_(6)H_(13)Cl_(2)PO_(4))and mono-chloropropyl phosphate(C_(3)H_(8)ClPO_(4)).Both intracellular and extracellular enzymes could degrade TCPP,but intracellular degradation was dominant in the later reaction stage,and the presence of Cu^(2+) ions had a promoting effect.These findings developed novel insights into the potential mechanism of TCPP microbial degradation.
文摘he reaction of (2, 4-C_7H_11)_3Nd with HC=CC_6H_5 in toluene leads to [(2, 4-C_7H_11)_2NdC = CC_6H_5]_2 , which crystallizes in the space group P_cab with unit cell pa-rameters a=1 . 0489 (11), b=1.8033 (12), c=2. 1064 (15)nm and Z=4 , least-squares refinement based on 2323 observed reflections converged to a final R valueof 0. 08. The molecular structure shows that the complex is a dimer, in which two(2,4-C_7H_11)_2Nd units are connected by asymmetrical alkynide bridges with indepen-dent Nd-C(alkynide) bond lengths of 0. 2552(25)and 0. 2560(24)nm, Nd-C=C angles of 124. 1(17)° and 134. 2(17)°.
基金The National Natural Science Foundation of China (No.20271025) and the Natural Science Foundation of Shandong Province (No. L2003B01)
文摘Two tri(2-chlorobenzyl)tin(IV) complexes with dithiocarbamate ligands (2-Cl- C6H4CH2)3SnS2CN(C5H10) 1 and (2-Cl-C6H4CH2)3SnS2CN(C4H9N) 2 have been synthesized by the reaction of tri(2-chlorobenzyl)tin(IV) chloride with dithiocarbamates and characterized by elemental analysis, IR and 1H NMR. The crystal structures were determined by X-ray single-crystal diffraction. The crystal of complex 1 belongs to triclinic, space group P with a = 9.121(5), b = 10.788(6), c = 15.549(8) ? a = 77.812(6), b = 88.279(8), g = 72.023(6)o, Z = 2, V = 1421.5(13) ?, Dc = 1.532 g/cm3, ?= 1.344 mm-1, F(000) = 660, R = 0.0382 and wR = 0.0984; and that of complex 2 is of monoclinic, space group P21/n with a = 13.892(10), b = 2.1274(8), c = 2.0553(15) ? b = 107.145(11)o, Z = 4, V = 2726(3) ?, Dc = 1.600 g/cm3, ?= 1.403 mm-1, F(000) = 1320, R = 0.0361 and wR = 0.0826. Their structures show a distorted trigonal bipyramidal configuration with five- coordination for the central tin atoms.
文摘A novel methacrylate monomer with bulky side group, tri(2-pyridyl)methyl methacrylate (Tr2PyMA), was synthesized and polymerized. The polymer obtained by radical polymerization exhibits high isotactic tacticity.
基金supported by the National Natural Science Foundation of China(Grant No.22478077,22278077).
文摘The semiconductor manufacturing industry imposes stringent requirements on the metal ion content of photoresist resin monomers.Tris(2-carboxyethyl)isocyanurate(H_(3)tci),a critical raw material for photoresist resin monomers,inevitably incorporates metal ions during production.However,its inherent carboxyethyl groups form stable coordination complexes with Cr(Ⅲ),hindering the semiconductor-grade resin monomer production.To achieve the ultra-deep removal of Cr(Ⅲ)at ultra-trace concentrations,inspired by the hard–soft-acid–base theory,we systematically modulated the electron-rich sulfonic acid group on polymers via controlled sulfonation conditions to achieve a novel series of adsorption materials(St)with ultra-high Cr(Ⅲ)adsorption affinity.The adsorption–recrystallization process using 6 g of St-V-15 could reduce the Cr(Ⅲ)concentration in a solution containing 1 g of H_(3)tci from 840 ppb to 27.5 ppb.Furthermore,St-V-15 exhibited a maximum adsorption capacity of 145 mg g^(−1)calculated using the Langmuir model and a rapid initial adsorption rate of 82.92 mg g^(−1)min^(−1)at 333 K.Additionally,St-V-15 demonstrated exceptional selectivity for Cr(Ⅲ)over competing ions(e.g.,K(Ⅰ),Mg(Ⅱ),Na(Ⅰ)and Zn(Ⅱ))and maintained stable performance over at least 10 adsorption–desorption cycles.The superior performance originated from the chelation between Cr(Ⅲ)and the sites of O atoms(S–O and S=O)combined with the electrostatic interaction between deprotonated sulfonic acid groups and Cr(Ⅲ).These results position St-V-15 as a promising adsorption material for ultra-trace Cr(Ⅲ)removal in H_(3)tci,offering a cost-effective solution for semiconductor-grade resin monomer production for the very first time.
基金supported by the National Key Research and Development Program of China(nos.2018YFA0703200 and 2018YFA0209401)the National Natural Science Foundation of China(nos.61890940,52073063,51903052,and 21733003)+1 种基金the Shanghai Pujiang Project(no.19PJ1400700),the Natural Science Foundation of Shanghai(no.21ZR1409600)the Program for Professor of Special Appointment(Eastern Scholar)at the Shanghai Institutions of Higher Learning.
文摘A mild one-step radical-to-radical synthetic strategy has been developed to directly produce a new family of diarylamine-substituted tris(2,4,6-trichlorophenyl)methyl(TTM)radicals TTM-DPA,TTM-DBPA,and TTM-DFA.The obtained TTM radical derivatives are extremely stable during chromatography purification and long-term storage in the solid state.
文摘Polyamine-based scavenger resins containing 2, 3 and 4 nitrogen atoms have been prepared and their comparative efficacy to scavenge appropriate electrophilic chemicals (acids, acid chlorides, isocyanates and aldehydes) from solutions has been studied. As expected, the scavenging efficiency is directly proportional to the number of nucleophic nitrogens present on the resin. The results have been compared with the performance of the popular scavenger resin, namely, tris(2-aminoethyl)amine resin, to conclude that the low-cost polyamine resins now prepared can be conveniently used as effectively as the expensive commercial product.
文摘Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the influence of the aziridine bonding agents family on the propellant aging. Aging of the prepared propellant samples was conducted as follows: 1. Four samples, one free of bonding agents, and three containing aziridine based bonding agents MAPO,HX-752, MAT4 were aged at 65°C. 2. Another four samples based on HX-752, MAT4 with different curing agents were aged at 65°C. The measured mechanical properties of the free bonding agent propellant samples were very far from the specifications and this illustrates the importance of the bonding agents in both the preparation and the aging phases.The prepared bonding agent 'MAT4' gave remarkable improvements of the mechanical properties comparing with HX-752 and MAPO. The aziridine bonding agents family inhibited the rate of decomposition of the propellant during the aging periods and supported the propellant matrix against decomposition at the elevate temperatures. Using of HMDI as curing agent gave slight better mechanical properties to the IPDI.
基金The authors acknowledge gratefully the provision of an Open Competition CASE studentship award to WAS by the UK Natural Environment Research Council(NERC ref.NE/I018352/1).Additional financial support to WAS from Ricardo-AEA is also acknowledged gratefully.The research leading to these results has received funding from DEFRA.
文摘The Furniture and Furnishings(Fire Safety)Regulations 1988 is the major driver for the use of chemical flame retardants(FRs)in soft furnishings marketed in the UK.While these regulations specify the level of flame retardancy required,they do not specify how such levels should be achieved.Consequently,it remains unclear which FRs are present in UK soft furnishings.This is important not only to help assess what FRs we may be exposed to currently,but which FRs are currently entering the waste stream with concomitant potential for release into the environment.To address this data gap,concentrations of polybrominated diphenyl ethers(PBDEs),hexabromocyclododecane(HBCDD)and a range of chlorinated organophosphate flame retardants(OPFRs)were measured in samples of domestic and office waste soft furnishings products entering the UK waste stream in 2011 and 2012.This preliminary study measured the FR content of:carpets(n?4),curtains(n?7),mattress fabrics(n?2),furniture foam(n?9),and furniture upholstery textiles(n?10).Polybrominated diphenyl ethers(PBDEs)and hexabromocyclododecane(HBCDD)were not found at significant concentrations(below detection limits in most samples)in any of the twenty two analysed products.In contrast,7 of the 9 furniture foam samples were treated with tris(2-chloroisopropyl)phosphate(TCIPP)at a mean concentration of 1.9%w/w,with another single foam sample containing tris(1,3-dichloroisopropyl)phosphate(TDCIPP)and tris(2-chloroethyl)phosphate(TCEP)at 1.1 and 0.5%respectively.By comparison,PBDE concentrations are within the range reported previously for UK indoor dust[18],rather than the percent by weight levels required to impart flame retardancy.
