An 8-hydroxyquinolinate-based metal–organic framework[Zn(L)]·2MeOH·H_(2)O(1)was synthesized for the first time by treating a novel 8-hydroxyquinolinate ligand H_(2)L involving two carboxylate groups with zi...An 8-hydroxyquinolinate-based metal–organic framework[Zn(L)]·2MeOH·H_(2)O(1)was synthesized for the first time by treating a novel 8-hydroxyquinolinate ligand H_(2)L involving two carboxylate groups with zinc salt.Based on single-crystal X-ray analysis,the Zn-MOF exhibits a porous framework assembled from interlinked nanotubes that are constructed from three 4_(3)helices.展开更多
The effects of La 3+ ion and chelate reagent 8 hydroxyquinoline on the corrosion rate of zinc in hydrochloric acid were investigated by using weight loss method and electrochemical method. It is found that in a ...The effects of La 3+ ion and chelate reagent 8 hydroxyquinoline on the corrosion rate of zinc in hydrochloric acid were investigated by using weight loss method and electrochemical method. It is found that in a specific concentration range of La 3+ ion and 8 hydroxyquinoline, the obvious corrosion inhibition synergism is obtained. The mechanism of corrosion inhibition synergism was discussed on basis of adsorption theory.展开更多
Two coordinate reactions,NdCl 3·6H 2O(s)+3CCl 3COOH(s)(or TCA)=Nd(TCA)3·3H 2O(s)+3HCl(g)+3H 2O(l)and Nd(TCA)3·3H 2O(s)+2C 9H 7NO(s)=Nd(TCA)(C 9H 6NO)2(s)+2CCl 3COOH(s)+3H 2O(l),were studied by the class...Two coordinate reactions,NdCl 3·6H 2O(s)+3CCl 3COOH(s)(or TCA)=Nd(TCA)3·3H 2O(s)+3HCl(g)+3H 2O(l)and Nd(TCA)3·3H 2O(s)+2C 9H 7NO(s)=Nd(TCA)(C 9H 6NO)2(s)+2CCl 3COOH(s)+3H 2O(l),were studied by the classical solution calorimetry at 298.15K.The molar dissolution enthalpies of the reactants and the products in certain solvent(the first reaction in 1 mol·L-1 HCl,the second in a mixed solution consisting of absolute ethyl alcohol,dimethyl sulfoxide and 4 mol·L-1 HCl)were measured by using an isoperibol calorimeter at 298.15K.From the results and other auxiliary quantities,the standard molar formation enthalpies of[Nd(TCA)3·3H 2O,s,298.15K]and[Nd(TCA)(C 9H 6NO)2,s,298.15K]are determined asΔfH m°[Nd(TCA)3·3H 2O,s,298.15K]=-3053.3 kJ·mol-1 andΔfH m°[Nd(TCA)(C 9H 6NO)2,s,298.15K]=-1355.6 kJ·mol-1.展开更多
Hydroxyquinoline 5 sulfonic acid, covalently bound to filter cellulose, was used for preconcentrating trace rare earth element(REE) ions from complex matrices and matrix separation, respectively. Multi REE ions wer...Hydroxyquinoline 5 sulfonic acid, covalently bound to filter cellulose, was used for preconcentrating trace rare earth element(REE) ions from complex matrices and matrix separation, respectively. Multi REE ions were preconcentrated on the column filled with 8 hydroxyquinoline 5 sulfonic acid cellulose filter and analysed by ICP AES after being eluted with dilute HNO 3. In the given pH range, alkali and alkaline earth metal ions can be separated as matrix elements; a high concentration factor is obtained and the eluates can be measured without interference. The usefulness of the method is shown by the control analyses of standard reference materials. [WT5FZ]展开更多
The amphiphilic derivatives of 8-hydroquinoline with alkyl chain have been synthesized.These derivatives can form stable monolayer on pure water and an aqueous subphase containing Metal ions.
A new fluorescent reagent, 7 (8 hydroxy 3, 6 disulfonaphthylazo) 8 hydroxyquinoline 5 sulfonic acid (HDNHQ) for the determination of magnesium has been developed. It reacted with magnesium to form a 1∶1 fluor...A new fluorescent reagent, 7 (8 hydroxy 3, 6 disulfonaphthylazo) 8 hydroxyquinoline 5 sulfonic acid (HDNHQ) for the determination of magnesium has been developed. It reacted with magnesium to form a 1∶1 fluorescent complex with λ ex / λ em =356/495 nm immediately at room temperature in ammonia ammonium chloride buffer (pH 10.7). A linear relationship was obtained in the magnesium concentration range of 0 160 ng·mL -1 with the detection limit of 0.04 ng·mL -1 . The proposed method was simple, rapid and sensitive. It has been successfully applied to the determination of trace magnesium in blood serum with recoveries of 103.75% and 98.16%, respectively.展开更多
Organic electroluminescent thin film using Znq 2 (Znq 2) as the emitting layer material with structure of glass/ITO/Znq 2/Al (cell)was fabricated. The V I curve, V B curve and electroluminescent spectra of the cell we...Organic electroluminescent thin film using Znq 2 (Znq 2) as the emitting layer material with structure of glass/ITO/Znq 2/Al (cell)was fabricated. The V I curve, V B curve and electroluminescent spectra of the cell were measured. Meanwhile the fluorescent spectra, excited spectra and absorption spectra of Znq 2 with powder and film states were also measured.展开更多
Herein,we studied the interaction of bovine pancreatic ribonuclease(RNase A)with[V^(Ⅳ)O(8-HQ)_(2)]–a promising antitrypanosomal,antituberculosis,and antitumor vanadium complex(VC)formed by 8-hydroxyquinolinato(8-HQ)...Herein,we studied the interaction of bovine pancreatic ribonuclease(RNase A)with[V^(Ⅳ)O(8-HQ)_(2)]–a promising antitrypanosomal,antituberculosis,and antitumor vanadium complex(VC)formed by 8-hydroxyquinolinato(8-HQ),reaching IC_(50) values lower than cisplatin in HCT116 and A2780 cancer lines(0.99 and 0.96μM vs.15.0 and 3.4μM)and the minimum inhibitory concentration(MIC)of 3.7μM against strains of Mycobacterium tuberculosis.The system was investigated by spectroscopic(UV-vis absorption spectroscopy,circular dichroism,and electron paramagnetic resonance),computational(docking and DFT calculations),and X-ray crystallographic multi-technique approach.Crystallographic results at pH 5.1 demonstrate that upon interaction with the protein,one of the 8-HQ ligands is replaced by a water molecule and by Glu111 side-chain,resulting in the inhibition of the RNase A activity.EPR data confirm the formation of this adduct,with V^(Ⅳ) coordinated by 8-HQ and by the couples(Glu-COO^(−);H_(2)O)at pH 5.1,(His-N;H_(2)O)at pH 7.4,and(His-N;OH^(−))or(Ser/Thr-O^(−),H_(2)O)at pH 8.4.Computational data unveil the reasons behind the ligand exchange,not observed for similar complexes like[V^(Ⅳ)O(picolinato)_(2)]and not predicted by thermodynamic considerations.Overall,our results show that the VC–protein binding is defined not only by the thermodynamic stability of VC but also by other factors,such as the structure and steric requirements of the metal ligands,with important implications in the drug delivery strategies.展开更多
A simple and versatile strategy,borrowing ideas from the chemistry of MOFs and COFs,is developed for the synthesis of coordination-supported organic polymers(COPs)via coordination between Al^(3+)and 5-amino-8-hydroxyq...A simple and versatile strategy,borrowing ideas from the chemistry of MOFs and COFs,is developed for the synthesis of coordination-supported organic polymers(COPs)via coordination between Al^(3+)and 5-amino-8-hydroxyquinoline together with organic imine-or imide-based polycondensation.The COPs with high surface areas(up to 1123 m^(2)g^(-1))and abundant mesopores(2.5 nm or 14 nm)possess good crystalline and porous structure after being soaked in boiling water.展开更多
A novel sensor for detection of trace gallium ion [Ga（III）] was created by stepwise modification of a gold electrode with fl-cyclodextrin （β-CD）/multi-walled carbon nanotubes （MWCNTs） and an ion imprinted polym...A novel sensor for detection of trace gallium ion [Ga（III）] was created by stepwise modification of a gold electrode with fl-cyclodextrin （β-CD）/multi-walled carbon nanotubes （MWCNTs） and an ion imprinted polymer （IIP）. The sensor surface morphology was characterized by scanning electron microscopy. The electrochemical performance of the imprinted sensor was investigated by cyclic voltammetry, differential pulse voltammetry and chronoamperometry. The sensor displayed excellent selectivity towards the target Ga（III） ion. Meanwhile, the introduced MWCNTs displayed noticeable catalytic activity, and fl：CD demonstrated significant enrichment capacity. A linear calibration curve was obtained covering the concentration range from 5.0 × 10 8 to 1.0 × 10-4 moloL-1, with a detection limit of 7.6× 10 9 mol·L-1. The proposed sensor was successfully applied to detect Ga（III） in real urine samples.展开更多
基金supported by the National Natural Science Foundation of China(Grants 21671002 and 21603001)Anhui Province Natural Science Funds for Distinguished Young Scholar(Grants 1808085J25)the Provincial Natural Science Research Program of Higher Education Institutions of Anhui Province(KJ2019A0071).
文摘An 8-hydroxyquinolinate-based metal–organic framework[Zn(L)]·2MeOH·H_(2)O(1)was synthesized for the first time by treating a novel 8-hydroxyquinolinate ligand H_(2)L involving two carboxylate groups with zinc salt.Based on single-crystal X-ray analysis,the Zn-MOF exhibits a porous framework assembled from interlinked nanotubes that are constructed from three 4_(3)helices.
文摘The effects of La 3+ ion and chelate reagent 8 hydroxyquinoline on the corrosion rate of zinc in hydrochloric acid were investigated by using weight loss method and electrochemical method. It is found that in a specific concentration range of La 3+ ion and 8 hydroxyquinoline, the obvious corrosion inhibition synergism is obtained. The mechanism of corrosion inhibition synergism was discussed on basis of adsorption theory.
基金the Hunan Provincial Educational Ministry Foundation of China(00C001)
文摘Two coordinate reactions,NdCl 3·6H 2O(s)+3CCl 3COOH(s)(or TCA)=Nd(TCA)3·3H 2O(s)+3HCl(g)+3H 2O(l)and Nd(TCA)3·3H 2O(s)+2C 9H 7NO(s)=Nd(TCA)(C 9H 6NO)2(s)+2CCl 3COOH(s)+3H 2O(l),were studied by the classical solution calorimetry at 298.15K.The molar dissolution enthalpies of the reactants and the products in certain solvent(the first reaction in 1 mol·L-1 HCl,the second in a mixed solution consisting of absolute ethyl alcohol,dimethyl sulfoxide and 4 mol·L-1 HCl)were measured by using an isoperibol calorimeter at 298.15K.From the results and other auxiliary quantities,the standard molar formation enthalpies of[Nd(TCA)3·3H 2O,s,298.15K]and[Nd(TCA)(C 9H 6NO)2,s,298.15K]are determined asΔfH m°[Nd(TCA)3·3H 2O,s,298.15K]=-3053.3 kJ·mol-1 andΔfH m°[Nd(TCA)(C 9H 6NO)2,s,298.15K]=-1355.6 kJ·mol-1.
基金Supported by the National Natural Science Foundation of China
文摘Hydroxyquinoline 5 sulfonic acid, covalently bound to filter cellulose, was used for preconcentrating trace rare earth element(REE) ions from complex matrices and matrix separation, respectively. Multi REE ions were preconcentrated on the column filled with 8 hydroxyquinoline 5 sulfonic acid cellulose filter and analysed by ICP AES after being eluted with dilute HNO 3. In the given pH range, alkali and alkaline earth metal ions can be separated as matrix elements; a high concentration factor is obtained and the eluates can be measured without interference. The usefulness of the method is shown by the control analyses of standard reference materials. [WT5FZ]
文摘The amphiphilic derivatives of 8-hydroquinoline with alkyl chain have been synthesized.These derivatives can form stable monolayer on pure water and an aqueous subphase containing Metal ions.
基金Supported by the Zi-Qiang Foundation of Wuhan U niversit
文摘A new fluorescent reagent, 7 (8 hydroxy 3, 6 disulfonaphthylazo) 8 hydroxyquinoline 5 sulfonic acid (HDNHQ) for the determination of magnesium has been developed. It reacted with magnesium to form a 1∶1 fluorescent complex with λ ex / λ em =356/495 nm immediately at room temperature in ammonia ammonium chloride buffer (pH 10.7). A linear relationship was obtained in the magnesium concentration range of 0 160 ng·mL -1 with the detection limit of 0.04 ng·mL -1 . The proposed method was simple, rapid and sensitive. It has been successfully applied to the determination of trace magnesium in blood serum with recoveries of 103.75% and 98.16%, respectively.
文摘Organic electroluminescent thin film using Znq 2 (Znq 2) as the emitting layer material with structure of glass/ITO/Znq 2/Al (cell)was fabricated. The V I curve, V B curve and electroluminescent spectra of the cell were measured. Meanwhile the fluorescent spectra, excited spectra and absorption spectra of Znq 2 with powder and film states were also measured.
基金supported by Fondazione di Sardegna(grant FdSGarribba2017)Spanish MINECO’Juan de la Cierva program,FJC2019-039135-I.
文摘Herein,we studied the interaction of bovine pancreatic ribonuclease(RNase A)with[V^(Ⅳ)O(8-HQ)_(2)]–a promising antitrypanosomal,antituberculosis,and antitumor vanadium complex(VC)formed by 8-hydroxyquinolinato(8-HQ),reaching IC_(50) values lower than cisplatin in HCT116 and A2780 cancer lines(0.99 and 0.96μM vs.15.0 and 3.4μM)and the minimum inhibitory concentration(MIC)of 3.7μM against strains of Mycobacterium tuberculosis.The system was investigated by spectroscopic(UV-vis absorption spectroscopy,circular dichroism,and electron paramagnetic resonance),computational(docking and DFT calculations),and X-ray crystallographic multi-technique approach.Crystallographic results at pH 5.1 demonstrate that upon interaction with the protein,one of the 8-HQ ligands is replaced by a water molecule and by Glu111 side-chain,resulting in the inhibition of the RNase A activity.EPR data confirm the formation of this adduct,with V^(Ⅳ) coordinated by 8-HQ and by the couples(Glu-COO^(−);H_(2)O)at pH 5.1,(His-N;H_(2)O)at pH 7.4,and(His-N;OH^(−))or(Ser/Thr-O^(−),H_(2)O)at pH 8.4.Computational data unveil the reasons behind the ligand exchange,not observed for similar complexes like[V^(Ⅳ)O(picolinato)_(2)]and not predicted by thermodynamic considerations.Overall,our results show that the VC–protein binding is defined not only by the thermodynamic stability of VC but also by other factors,such as the structure and steric requirements of the metal ligands,with important implications in the drug delivery strategies.
基金supported by the U.S.Department of Energy,Office of Science,Basic Energy Sciences,Chemical Sciences,Geosciences,and Biosciences Division.The electron microscopy at ORNL(S.Z.Y.)supported by the U.S.Department of Energy,Office of Science,Basic Energy Sciences,Materials Sciences and Engineering Division+1 种基金Shanghai Pujiang Program(Grant No.17PJ1403500)Young Thousand Talented Program and National Natural Science Foundation of China(Grant No.21776174)for the partial support.
文摘A simple and versatile strategy,borrowing ideas from the chemistry of MOFs and COFs,is developed for the synthesis of coordination-supported organic polymers(COPs)via coordination between Al^(3+)and 5-amino-8-hydroxyquinoline together with organic imine-or imide-based polycondensation.The COPs with high surface areas(up to 1123 m^(2)g^(-1))and abundant mesopores(2.5 nm or 14 nm)possess good crystalline and porous structure after being soaked in boiling water.
基金This work was supported by the National Natural Science Foundation of China （No. 21005030）, the Scientific Research Fund of Hunan Provincial Education Department （No. 10A099） and the Graduate Innovation Foundation of Hunan Province, China （No. CX2010B394）.
文摘A novel sensor for detection of trace gallium ion [Ga（III）] was created by stepwise modification of a gold electrode with fl-cyclodextrin （β-CD）/multi-walled carbon nanotubes （MWCNTs） and an ion imprinted polymer （IIP）. The sensor surface morphology was characterized by scanning electron microscopy. The electrochemical performance of the imprinted sensor was investigated by cyclic voltammetry, differential pulse voltammetry and chronoamperometry. The sensor displayed excellent selectivity towards the target Ga（III） ion. Meanwhile, the introduced MWCNTs displayed noticeable catalytic activity, and fl：CD demonstrated significant enrichment capacity. A linear calibration curve was obtained covering the concentration range from 5.0 × 10 8 to 1.0 × 10-4 moloL-1, with a detection limit of 7.6× 10 9 mol·L-1. The proposed sensor was successfully applied to detect Ga（III） in real urine samples.
