The palladium-salen complex palladium(Ⅱ) N,N'-bis{[5-(triphenylphosphonium)-methyl]salicylidene}-1,2-ethanediamine chloride was found to be a highly active catalyst for the copper- and solvent-free coupling react...The palladium-salen complex palladium(Ⅱ) N,N'-bis{[5-(triphenylphosphonium)-methyl]salicylidene}-1,2-ethanediamine chloride was found to be a highly active catalyst for the copper- and solvent-free coupling reaction of terminal alkynes with different acyl chlorides in the presence of triethylamine as base,giving excellent ynones under aerobic conditions.展开更多
Co（Ⅱ）-salen was encapsulated in MIL- 100（Cr） metal organic framework by ＂ship in a bottle＂ to synthesize a new electrocatalyst, Cosalen@MIL- 100（Cr）. The material was characterized by XRD, FT-IR, UV-Vis and N...Co（Ⅱ）-salen was encapsulated in MIL- 100（Cr） metal organic framework by ＂ship in a bottle＂ to synthesize a new electrocatalyst, Cosalen@MIL- 100（Cr）. The material was characterized by XRD, FT-IR, UV-Vis and N2-adsorption. The Cosalen@MIL-100（Cr） modified glassy carbon electrode exhibits a well-defined reduction peak at the potential of -0.21 V toward the oxygen reduction reaction （ORR） by cyclic voltam- metry （CV） in pH = 6.84 phosphate buffer. Almost 400 mV positive shift of potential at Cosalen@MIL-100（Cr） modified electrode for ORR compared with that at bare glassy carbon, indicates that Cosalen@MIL-100（Cr） possesses excellent electrocatalytic activity. The transferred number of electrons for ORR was determined by chronocoulometry. The result suggests that the introduction of Co（II）-salen complex into MOF increases the electrocatalytic activity via a four-electron reduction pathway. Furthermore, this electrocatalyst exhibits good stability and reproducibility.展开更多
Several new chiral organogallium and indium complexes with chiral Salen (1 and 2) as anxciliary ligands have been synthesized and characterized by elemental analysis, IR, 1H NMR and Mass spectroscopy. For the gallium...Several new chiral organogallium and indium complexes with chiral Salen (1 and 2) as anxciliary ligands have been synthesized and characterized by elemental analysis, IR, 1H NMR and Mass spectroscopy. For the gallium, mono and bimetallic complexes were obtained, whereas ring closure complexes of indium were obtained.展开更多
An imidazole modified mesoporous material has been prepared through a co-condensation procedure and adopted to covalently anchor chiral Mn(Ⅲ) salen complex. The active centers in the as-synthesized catalyst were pres...An imidazole modified mesoporous material has been prepared through a co-condensation procedure and adopted to covalently anchor chiral Mn(Ⅲ) salen complex. The active centers in the as-synthesized catalyst were presented in the form of ionic species. The results of XRD, FTIR, DRUV-Vis, and N2 sorp-tion confirmed the successful immobilization of chiral Mn(Ⅲ) salen complex inside the channels of the modified support and the maintenance of the mesoporous structure of parent support in the immobi-lized catalyst. This heterogeneous catalyst exhibited comparable catalytic activity and enantioselectiv-ity to those of the homogeneous counterpart in the asymmetric epoxidation of unfunctionalized olefins. Furthermore, notably high turnover frequencies have been obtained over this heterogeneous catalyst for the relatively short reaction time and low catalyst amount, due in part to the ionic property as well as the uniform distribution of the active centers.展开更多
A homochiral complex,Ni 2 （salen） 2 （1,salen=（R,R）-（-）-N,N-bis（3-tert-butyl-5-（4ethynylpyridyl）salicyl-idene）-1,2-diaminocyclohexane）,has been synthesized and characterized by IR,microanalysis,CD spectra,T...A homochiral complex,Ni 2 （salen） 2 （1,salen=（R,R）-（-）-N,N-bis（3-tert-butyl-5-（4ethynylpyridyl）salicyl-idene）-1,2-diaminocyclohexane）,has been synthesized and characterized by IR,microanalysis,CD spectra,TGA,powder and single-crystal X-ray crystallography.It crystallizes in triclinic,space group P1 with a=11.896（2）,b=12.571（3）,c=13.197（3）,α=65.61（3）,β=73.90（3）,γ=75.87（3）o,V=1707.9（6） 3,Z=2,C 42 H 42 N 4 NiO 2,M r=693.51,D c=1.349 g/cm 3,F（000）=732,μ=0.612 mm-1,GOOF=1.015,the final R=0.0290 and wR=0.0796 for 9002 observed reflections with I 2σ（Ⅰ）.The complex architecture is constructed by intermolecular π···π interaction and assembled into a 2D structure via C-H···π interactions between the cyclohexanes and pyridine rings.展开更多
Three inexpensive and air-/moisture-stable Salen-Cu complexes 1-3 were evaluated to be a novel class of catalysts for the N-arylation of imidazoles with aryl halides. A variety of aryl iodides, bromides underwent the ...Three inexpensive and air-/moisture-stable Salen-Cu complexes 1-3 were evaluated to be a novel class of catalysts for the N-arylation of imidazoles with aryl halides. A variety of aryl iodides, bromides underwent the coupling with imida-zoles, promoted by the complex 3, in moderate to excellent yields without the protection by an inert gas.展开更多
A new stable salen Schiff base cobalt and crown ether sodium complex （SalCo-NaB18C6） was prepared through copolymerization. This copolymer complex was applied to catalytic oxidation of hydrocarbon compound with mole...A new stable salen Schiff base cobalt and crown ether sodium complex （SalCo-NaB18C6） was prepared through copolymerization. This copolymer complex was applied to catalytic oxidation of hydrocarbon compound with molecular oxygen without reductant, which was shown the higher activity and selectivity for ketone, and reused effectively.展开更多
A number of salen-metal complexes were prepared and their enantioselective catalytic properties toward the asymmetric iodolactonization of （E）- and （Z）-5-substituted-4-pentenoic acid derivatives were investigated....A number of salen-metal complexes were prepared and their enantioselective catalytic properties toward the asymmetric iodolactonization of （E）- and （Z）-5-substituted-4-pentenoic acid derivatives were investigated. The catalyst system based on salen-Co（II） complex exhibited moderate to good enantioselectivity with the e.e. value ranging from 53% to 74%, as well as high regioselectivity of δ- vs. γ-iodolactones. The salen-Co（II） complex showed the highest enantioselectivity on the asymmetric iodolactonizations of （Z）-5-substituted-4-pentenoic acid derivatives among these reagent-controlled iodolactonization protocols known so far.展开更多
Schiff base was synthesized by using salicylaldehyde and ethylenediamine as raw materials,and then Co(Salen)complex was synthesized by using Schiff base and Co.The structure and purity of the samples were tested by ma...Schiff base was synthesized by using salicylaldehyde and ethylenediamine as raw materials,and then Co(Salen)complex was synthesized by using Schiff base and Co.The structure and purity of the samples were tested by mass spectrum.Then the orthogonal test method was used to study the catalytic performance of the complex in the reaction of benzil produced from benzoin,and the optimal reaction conditions were obtained finally.The results showed when the reaction temperature was 80℃,and the reaction time was 2h,the yield of benzil produced from benzoin by using Co(Salen)as catalyst reached the maximum 37.28%.展开更多
Six novel chiral dinuclear Salen complexes[Cu 2 L 1 ·H 2 O(3a),Cu 2 L 2 (3b),Ni 2 L 1 ·2H 2 O(4a),Ni 2 L 2 (4b),Mn 2 Cl 2 L 1 ·H 2 O(5a),Mn 2 Cl 2 L 2 (5b)]have been synthesized(L 1 and L 2 are chiral d...Six novel chiral dinuclear Salen complexes[Cu 2 L 1 ·H 2 O(3a),Cu 2 L 2 (3b),Ni 2 L 1 ·2H 2 O(4a),Ni 2 L 2 (4b),Mn 2 Cl 2 L 1 ·H 2 O(5a),Mn 2 Cl 2 L 2 (5b)]have been synthesized(L 1 and L 2 are chiral dimeric Salen ligands with different chain length which were synthesized from(R,R) - diaminocyclohexane,salicylaldehyde,4,4 ’- (1,10 - decaneoxy)sali - cylaldehyde,4,4 ’- (1,6 - hexyloxy)salicylaldehyde).These compounds were charactered by elemental analysis,1 H NMR,FT - IR,UV - Vis and CD spectra.The FT - IR,UV - Vis and CD spectra were discussed and compared with those of monomeric ligand and complex in detail.It was found that the spectra properties of compounds of differ - ent chain length were almost alike,and the properties of dimeric and monomeric compound were similar too.Furthermore Cotton effect and Cotton split of CD spectra of these chiral compounds were explained by the exciton interaction theory.It seemed that the direction of Cotton split depend on the configuration of diaminohexane.(R,R) - diaminohexane determine the chirality of Salen compounds as negative,and the positive and negative compo - nent of Cotton split lie at higher and lower energy respectively.展开更多
基金the Research Council of Shahrood University of Technology for the support of this work
文摘The palladium-salen complex palladium(Ⅱ) N,N'-bis{[5-(triphenylphosphonium)-methyl]salicylidene}-1,2-ethanediamine chloride was found to be a highly active catalyst for the copper- and solvent-free coupling reaction of terminal alkynes with different acyl chlorides in the presence of triethylamine as base,giving excellent ynones under aerobic conditions.
基金supported by the Program for New Century Excellent Talents in University(NCET-04-0270)the National Basic Research Program of China(2011CB201301)
文摘Co（Ⅱ）-salen was encapsulated in MIL- 100（Cr） metal organic framework by ＂ship in a bottle＂ to synthesize a new electrocatalyst, Cosalen@MIL- 100（Cr）. The material was characterized by XRD, FT-IR, UV-Vis and N2-adsorption. The Cosalen@MIL-100（Cr） modified glassy carbon electrode exhibits a well-defined reduction peak at the potential of -0.21 V toward the oxygen reduction reaction （ORR） by cyclic voltam- metry （CV） in pH = 6.84 phosphate buffer. Almost 400 mV positive shift of potential at Cosalen@MIL-100（Cr） modified electrode for ORR compared with that at bare glassy carbon, indicates that Cosalen@MIL-100（Cr） possesses excellent electrocatalytic activity. The transferred number of electrons for ORR was determined by chronocoulometry. The result suggests that the introduction of Co（II）-salen complex into MOF increases the electrocatalytic activity via a four-electron reduction pathway. Furthermore, this electrocatalyst exhibits good stability and reproducibility.
基金the National Natural Science Foundation of China (20102002) Science Foundation of Jiangsu Province (BK2001030) and the 863 High Technology Program for their financial support. The research funds for Y. Pan from Qin-Lan Program of Jiangsu Province and
文摘Several new chiral organogallium and indium complexes with chiral Salen (1 and 2) as anxciliary ligands have been synthesized and characterized by elemental analysis, IR, 1H NMR and Mass spectroscopy. For the gallium, mono and bimetallic complexes were obtained, whereas ring closure complexes of indium were obtained.
基金Supported by the National Natural Science Foundation of China (Grant No. 20773069)the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 200800551017)
文摘An imidazole modified mesoporous material has been prepared through a co-condensation procedure and adopted to covalently anchor chiral Mn(Ⅲ) salen complex. The active centers in the as-synthesized catalyst were presented in the form of ionic species. The results of XRD, FTIR, DRUV-Vis, and N2 sorp-tion confirmed the successful immobilization of chiral Mn(Ⅲ) salen complex inside the channels of the modified support and the maintenance of the mesoporous structure of parent support in the immobi-lized catalyst. This heterogeneous catalyst exhibited comparable catalytic activity and enantioselectiv-ity to those of the homogeneous counterpart in the asymmetric epoxidation of unfunctionalized olefins. Furthermore, notably high turnover frequencies have been obtained over this heterogeneous catalyst for the relatively short reaction time and low catalyst amount, due in part to the ionic property as well as the uniform distribution of the active centers.
基金supported by NSFC-20971085"973" Programs (2007CB209701 and 2009CB930403)+1 种基金the Major Fundamental Research of Shanghai Science and Technology Committee (10dj1400102)the Key Project of State Education Ministry
文摘A homochiral complex,Ni 2 （salen） 2 （1,salen=（R,R）-（-）-N,N-bis（3-tert-butyl-5-（4ethynylpyridyl）salicyl-idene）-1,2-diaminocyclohexane）,has been synthesized and characterized by IR,microanalysis,CD spectra,TGA,powder and single-crystal X-ray crystallography.It crystallizes in triclinic,space group P1 with a=11.896（2）,b=12.571（3）,c=13.197（3）,α=65.61（3）,β=73.90（3）,γ=75.87（3）o,V=1707.9（6） 3,Z=2,C 42 H 42 N 4 NiO 2,M r=693.51,D c=1.349 g/cm 3,F（000）=732,μ=0.612 mm-1,GOOF=1.015,the final R=0.0290 and wR=0.0796 for 9002 observed reflections with I 2σ（Ⅰ）.The complex architecture is constructed by intermolecular π···π interaction and assembled into a 2D structure via C-H···π interactions between the cyclohexanes and pyridine rings.
文摘Three inexpensive and air-/moisture-stable Salen-Cu complexes 1-3 were evaluated to be a novel class of catalysts for the N-arylation of imidazoles with aryl halides. A variety of aryl iodides, bromides underwent the coupling with imida-zoles, promoted by the complex 3, in moderate to excellent yields without the protection by an inert gas.
基金the National Natural Science Foundation of China （No.20274034）.
文摘A new stable salen Schiff base cobalt and crown ether sodium complex （SalCo-NaB18C6） was prepared through copolymerization. This copolymer complex was applied to catalytic oxidation of hydrocarbon compound with molecular oxygen without reductant, which was shown the higher activity and selectivity for ketone, and reused effectively.
文摘A number of salen-metal complexes were prepared and their enantioselective catalytic properties toward the asymmetric iodolactonization of （E）- and （Z）-5-substituted-4-pentenoic acid derivatives were investigated. The catalyst system based on salen-Co（II） complex exhibited moderate to good enantioselectivity with the e.e. value ranging from 53% to 74%, as well as high regioselectivity of δ- vs. γ-iodolactones. The salen-Co（II） complex showed the highest enantioselectivity on the asymmetric iodolactonizations of （Z）-5-substituted-4-pentenoic acid derivatives among these reagent-controlled iodolactonization protocols known so far.
文摘Schiff base was synthesized by using salicylaldehyde and ethylenediamine as raw materials,and then Co(Salen)complex was synthesized by using Schiff base and Co.The structure and purity of the samples were tested by mass spectrum.Then the orthogonal test method was used to study the catalytic performance of the complex in the reaction of benzil produced from benzoin,and the optimal reaction conditions were obtained finally.The results showed when the reaction temperature was 80℃,and the reaction time was 2h,the yield of benzil produced from benzoin by using Co(Salen)as catalyst reached the maximum 37.28%.
文摘Six novel chiral dinuclear Salen complexes[Cu 2 L 1 ·H 2 O(3a),Cu 2 L 2 (3b),Ni 2 L 1 ·2H 2 O(4a),Ni 2 L 2 (4b),Mn 2 Cl 2 L 1 ·H 2 O(5a),Mn 2 Cl 2 L 2 (5b)]have been synthesized(L 1 and L 2 are chiral dimeric Salen ligands with different chain length which were synthesized from(R,R) - diaminocyclohexane,salicylaldehyde,4,4 ’- (1,10 - decaneoxy)sali - cylaldehyde,4,4 ’- (1,6 - hexyloxy)salicylaldehyde).These compounds were charactered by elemental analysis,1 H NMR,FT - IR,UV - Vis and CD spectra.The FT - IR,UV - Vis and CD spectra were discussed and compared with those of monomeric ligand and complex in detail.It was found that the spectra properties of compounds of differ - ent chain length were almost alike,and the properties of dimeric and monomeric compound were similar too.Furthermore Cotton effect and Cotton split of CD spectra of these chiral compounds were explained by the exciton interaction theory.It seemed that the direction of Cotton split depend on the configuration of diaminohexane.(R,R) - diaminohexane determine the chirality of Salen compounds as negative,and the positive and negative compo - nent of Cotton split lie at higher and lower energy respectively.
