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Synthesis, Characterization and Fluorescence Properties of Copper, Silver, Cadmium Coordination Polymers

Author: YangYuRong
Tutor: ShiJiCheng
School: Fujian Normal University
Course: Inorganic Chemistry
Keywords: Coordination polymers L- tartaric acid Isonicotinic acid Hydrothermal Synthesis Crystal structure Fluorescence
CLC: O631.3
Type: Master's thesis
Year: 2009
Downloads: 387
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Abstract

The coordination polymer because of its asymmetric catalysis, gas adsorption, the potential applications of nonlinear optical and magnetic materials, and become in recent years of chemical research hotspot one of the areas. Therefore, the research functions of organic ligands and metal ions directed assembly law and the exploration of the relationship between the structure and properties of the coordination polymers is of great significance for the development of supramolecular chemistry and materials chemistry. As these by the structural characteristics of the metal ions and organic ligands assembled coordination polymers and performance largely depends on the structure of the organic ligand. Therefore, a reasonable choice or design and synthesis of organic ligands is one of the priorities of the efficient synthesis of coordination polymers. L-tartaric acid is a readily available, having a chiral compound, its carboxylate radical and a hydroxyl group are easy to participate in the group of the ligand, and therefore L-tartaric acid is synthesized several organic ligand, and they were characterized. By the hydrothermal synthesis technique, using (4R, 5R) -2,2 - bis - methyl-N, N'-bis (pyridin-4 - yl) -1,3 - dioxolane ring -4,5 - bis formamide (the C ₁₇ H ₁₈ O ₄ N ₄) and cadmium salts synthesized novel chiral ligands polymer [Cd _{the 6} (the C ₄ H ₂ O ₆) ₆] · CH ₃ OH (1); 2,3-O-isopropylidene-L-tartaric acid sodium the (the Na ₂ C ₇ H ₈ O ₆), isonicotinic acid silver salt and copper salts were synthesized coordination polymers [Ag (C ₆ H < sub> 4 O ₂) (C ₆ H ₅ O ₂)] · 4H < sub> 2 O (2) and [Cu (C ₆ H ₄ NO ₂) _{2 ] · 4H ₂ O (3). The above three crystals were characterized by IR, elemental analysis and single crystal X-ray diffraction. Coordination polymers (1) retain the chiral ligand L-tartaric acid, orthorhombic, C222 ₁ chiral space group. Coordination polymers (1) and (3) are monoclinic system, P (?) Space group, the structure of the two compounds are present complex hydrogen bonding interactions. Found that the fluorescence intensity of the polymer (1) of the ligand is a ligand three times by their fluorescence test, the fluorescent luminous intensity of the coordination polymer (2) stronger than the ligand. Interpreted as a ligand with a metal ion complexing effect caused by a ligand to a metal ion or a metal ion to ligand charge-transfer (LMCT), thus increasing the luminous intensity of the ligand polymer. Coordination polymer (3) of the fluorescence emission peak than the ligand occurs blue shift of the emission peak broadening.}

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