以硝基对苯二甲酸和4,4′-联吡啶为配体的四个金属Ag配合物的合成、结构多样性和电子光谱（英文）

Structural Diversity, Supramolecular Assembly, and Electronic Spectra of Four Silver Coordination Polymers with Same Components of 2-Nitro-1,4-benzenedicarboxylate and 4,4′-Bipyridine

由2-硝基-1,4-对苯二甲酸和4,4′-联吡啶作为起始原料合成了4个金属银的配位聚合物,{[Ag(4,4′-bipy)]·2-Hnbdc·2H2O·CH3OH}n(1),{[Ag(4,4′-bipy)(2-Hnbdc)]}n(2),{[Ag2(4,4′-bipy)2(2-nbdc)]·2H2O}n(3),和{[Ag2(4,4′-bipy)2(2-nbdc)(H2O)]·2H2O}n(4)。通过IR、元素分析、TG、UV和荧光光谱以及粉末衍射等手段,对配合物进行了表征和性质研究。单晶衍射分析显示,配合物1为1D阴-阳离子型聚合物,配合物2为1D双链结构,且结构中不存在溶剂分子。配合物3和4均为1D链状结构。结构的多样性主要是由配体构象、硝基对苯二甲酸的配位模式以及弱作用(如π-π堆积、Ag…Ag作用以及氢键等)导致的。结构的不同也使得它们的稳定性、紫外吸收以及荧光光谱存在着差异。

Four diverse silver coordination polymers with the same components of silver, 4,4＇-bipyridine（4,4＇-bipy）, and 2-nitro-l,4-benzenedicarboxylic acid （2-H2nbdc） have been synthesized, namely {[Ag（4,4′-bipy）]·2-Hnbdc·2H2O·CH3OH}n（1）,{[Ag（4,4′-bipy）（2-Hnbdc）]}n（2）,{[Ag2（4,4′-bipy）2（2-nbdc）]·2H2O}n（3）, and {[Ag2（4,4′-bipy）2（2-nbdc）（H2O）]·2H2O}n（4）, and characterized by IR, elemental analysis, TG, UV, fluorescence spectra, and powder X-ray analysis. The single crystal X-ray analysis showed that complex 1 is a 1D cation-anionic polymer, complex 2 is a 1D double chain without any solvent, and complexes 3 and 4 are 1D chain structures. Diverse structures differ with respect to molecular conformation, coordination modes of 2-Hnbdc, and weak interactions. In these complexes there are weak bonds, or-or aromatic stacking interactions, Ag…Ag interaction, and hydrogen bonding. The diverse structures are related to the thermal stability, UV absorptions, and fluorescence emissions. CCDC： 945166, 1; 945167, 2; 945168, 3; 945169, 4.