作者:Bhaskar Nath、Jubaraj B. Baruah
DOI:10.1039/c2dt30554b
日期:——
A series of linear coordination polymers, metallacycles of cadmium(II) and mercury(II) of flexible carboxylic acid ligands, RCH3-CH3–,5-CH3–,6-(–OCH2CO2H)C6H2}2, (when R = C6H5, (H2L1); 2-NO2C6H4– (H2L2) and 3-NO2C6H4– (H2L3)) are synthesized and characterized. [CdL1 (py)3]n·3nH2O (py = pyridine) is a linear coordination polymer, whereas [CdL2(py)(CH3OH)]2·CH3OH is a dinuclear complex of cadmium with a Cd2O2 type of core. The latter is obtained from reaction of cadmium(II) acetate with H2L2 in methanol followed by reaction with pyridine. A similar reaction of cadmium(II) acetate with H2L2 in dimethylformamide results in the formation of a cadmium metallacycle, namely [CdL2 (py)2(H2O)]2·H2O. The H2L3 reacted with cadmium(II) acetate in the presence of pyridine to form a metallacycle [CdL3(py)2(H2O)]2·3H2O. The ligand H2L2 form mercury(II) metallacycle [HgL2(4-mepy)2]2 in the presence of 4-methylpyridine (4-mepy) and the ligand H2L3 forms metallacycle [HgL3(3-mepy)2]2·DMF in the presence of 3-methylpyridine (3-mepy). The potassium salts of H2L1 and H2L2 were found to be coordination polymers and these potassium coordination polymers were structurally characterized.
一系列线性配位聚合物,即柔性羧酸配体RCH3-CH3–,5-CH3–,6-(–OCH2CO2H)C6H2}2的镉(II)和汞(II)金属环状化合物(当R = C6H5时,(H2L1);2-NO2C6H4– (H2L2) 和 3-NO2C6H4– (H2L3))被合成并表征。[CdL1 (py)3]n·3nH2O(py = 吡啶)是一个线性配位聚合物,而[CdL2(py)(CH3OH)]2·CH3OH是一个具有Cd2O2型核心的双核镉配合物。后者是通过镉(II)乙酸与H2L2在甲醇中反应,随后与吡啶反应得到的。类似地,镉(II)乙酸与H2L2在二甲基甲酰胺中反应形成一个镉金属环,即[CdL2 (py)2(H2O)]2·H2O。H2L3在吡啶存在下与镉(II)乙酸反应,形成金属环[CdL3(py)2(H2O)]2·3H2O。配体H2L2在4-甲基吡啶(4-mepy)存在下形成汞(II)金属环[HgL2(4-mepy)2]2,而配体H2L3在3-甲基吡啶(3-mepy)存在下形成金属环[HgL3(3-mepy)2]2·DMF。H2L1和H2L2的钾盐被发现是配位聚合物,这些钾的配位聚合物在结构上得到了表征。