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
Jacobsen's catalyst was immobilized onto SBA-15 by multi-step grafting, and this heterogenized catalyst exhibited comparable catalytic performance with the corresponding homogeneous counterpart for the epoxidation...Jacobsen's catalyst was immobilized onto SBA-15 by multi-step grafting, and this heterogenized catalyst exhibited comparable catalytic performance with the corresponding homogeneous counterpart for the epoxidation of alkenes, and the catalyst could be recycled effectively several times.展开更多
The authors have designed and synthesized new chiral salen-type metal （M = Fe, Co, Ni, Cu, Zn） complexes （1-5） for new conceptual dyes （co-sensitizer or colorful multi-dyes） of DSSCs （dye-sensitized solar cells...The authors have designed and synthesized new chiral salen-type metal （M = Fe, Co, Ni, Cu, Zn） complexes （1-5） for new conceptual dyes （co-sensitizer or colorful multi-dyes） of DSSCs （dye-sensitized solar cells）. The authors measured substituent effects on their absorption spectra and redox properties, and compared them with TD-DFT （time-dependent density functional theory） calculations. Electron withdrawing groups resulted in red-shift of ultraviolet-visible （UV-Vis） spectra. For the first time, the authors also proposed and confirmed the importance of substituent effects on their electric transition dipole moments, calculated by TD-DFT for designing dyes. Chemisorption for TiO2 of the complex by carboxyl groups was confirmed by XPS measurement. In view of electronic properties, all compounds have the possibility to be dyes of DSSCs.展开更多
The reaction kinetics of hydrolysis resolution of racemic epichlorohydrin to chiral chloropropandiol and optically active epichlorohydrin, catalyzed by chiral salen metal complexes, was studied by using gas chromatogr...The reaction kinetics of hydrolysis resolution of racemic epichlorohydrin to chiral chloropropandiol and optically active epichlorohydrin, catalyzed by chiral salen metal complexes, was studied by using gas chromatography. The effects of temperature, catalyst type and catalyst concentration on the reaction rate were explored. On the experimental results, some kinetic regularity for the reaction has been obtained.展开更多
A novel chiral Salen ligand with a glucose moiety was synthesized from the condensation of 1,2:5,6-di-O-isopropylidene-3-O-methylene-5-(3-tert-butyl-2-hydroxy benzaldehyde) -α-D-glucofuranose with (1R,2R)-1,2-diamino...A novel chiral Salen ligand with a glucose moiety was synthesized from the condensation of 1,2:5,6-di-O-isopropylidene-3-O-methylene-5-(3-tert-butyl-2-hydroxy benzaldehyde) -α-D-glucofuranose with (1R,2R)-1,2-diaminocyclohexane. Several chiral complexes of Mn3+, Fe3+, Co2+ and Cu2+ were prepared from this ligand. Both the ligand and the complexes were characterized by elemental analysis, NMR, IR, MS, and UV-Vis.展开更多
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.
文摘Jacobsen's catalyst was immobilized onto SBA-15 by multi-step grafting, and this heterogenized catalyst exhibited comparable catalytic performance with the corresponding homogeneous counterpart for the epoxidation of alkenes, and the catalyst could be recycled effectively several times.
文摘The authors have designed and synthesized new chiral salen-type metal （M = Fe, Co, Ni, Cu, Zn） complexes （1-5） for new conceptual dyes （co-sensitizer or colorful multi-dyes） of DSSCs （dye-sensitized solar cells）. The authors measured substituent effects on their absorption spectra and redox properties, and compared them with TD-DFT （time-dependent density functional theory） calculations. Electron withdrawing groups resulted in red-shift of ultraviolet-visible （UV-Vis） spectra. For the first time, the authors also proposed and confirmed the importance of substituent effects on their electric transition dipole moments, calculated by TD-DFT for designing dyes. Chemisorption for TiO2 of the complex by carboxyl groups was confirmed by XPS measurement. In view of electronic properties, all compounds have the possibility to be dyes of DSSCs.
文摘The reaction kinetics of hydrolysis resolution of racemic epichlorohydrin to chiral chloropropandiol and optically active epichlorohydrin, catalyzed by chiral salen metal complexes, was studied by using gas chromatography. The effects of temperature, catalyst type and catalyst concentration on the reaction rate were explored. On the experimental results, some kinetic regularity for the reaction has been obtained.
文摘A novel chiral Salen ligand with a glucose moiety was synthesized from the condensation of 1,2:5,6-di-O-isopropylidene-3-O-methylene-5-(3-tert-butyl-2-hydroxy benzaldehyde) -α-D-glucofuranose with (1R,2R)-1,2-diaminocyclohexane. Several chiral complexes of Mn3+, Fe3+, Co2+ and Cu2+ were prepared from this ligand. Both the ligand and the complexes were characterized by elemental analysis, NMR, IR, MS, and UV-Vis.
