Syntheses, Crystal Structures and Fluorescence Properties of Four Coordination Polymers Based on Enantiomeric 2-(4-Carboxyphenyl)-4,5-dihydrothiazole-4-carboxylic Acid Ligands

【摘要】 A pair of enatiomerically pure ligands,（R-）/（S-）2-（4-carboxyphenyl）-4,5-dihydrothiazole-4-carboxylic acid（H₂L^R & H₂L^S）, have been synthesized by the reactions of 4-cyanobenzoic acid with L-and D-cysteine, respectively. Four coordination polymers have been prepared from the ligands and structurally determined by single-crystal X-ray diffraction analysis. Complexes 1 R and 1 S([NiL（Py）（H₂ O）]×H₂ O, for 1 R, L =（L^R）^2-; for 1 S, L =（L^S）^2-) exhibit chiral helical one-dimensional chains, and complexes 2 R and 2 S({[ZnL₂（H₂ O）₃]×CH₃ CN}_n, for 2 R L =（L^R）^2-, for 2 S L =（L_S）^2-) are two-dimensional sheets. Luminescent and chir-optical properties have been investigated and compared with the free ligands. The complexes have blue-shift in luminescence spectrum compared with the free ligands.更多还原

【Abstract】 A pair of enatiomerically pure ligands,（R-）/（S-）2-（4-carboxyphenyl）-4,5-dihydrothiazole-4-carboxylic acid（H₂L^R & H₂L^S）, have been synthesized by the reactions of 4-cyanobenzoic acid with L-and D-cysteine, respectively. Four coordination polymers have been prepared from the ligands and structurally determined by single-crystal X-ray diffraction analysis. Complexes 1 R and 1 S([NiL（Py）（H₂ O）]×H₂ O, for 1 R, L =（L^R）^2-; for 1 S, L =（L^S）^2-) exhibit chiral helical one-dimensional chains, and complexes 2 R and 2 S({[ZnL₂（H₂ O）₃]×CH₃ CN}_n, for 2 R L =（L^R）^2-, for 2 S L =（L_S）^2-) are two-dimensional sheets. Luminescent and chir-optical properties have been investigated and compared with the free ligands. The complexes have blue-shift in luminescence spectrum compared with the free ligands.更多还原