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Syntheses, Structures, and Magnetic Properties of Mixed-ligand Complexes of Co(II) Based on N-Heterocyclic and Different Carboxylate Ligands

机译:基于N-杂环和不同羧酸盐配体的CO(II)混合配体复合物的合成,结构和磁性

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摘要

Two novel transition-metal coordination polymers with the formulas [Co(L1)(bbi)(H2O)](n) (1) and {[Co(L2)(phen)]H2O}(n) (2) (H(2)L1=1,4-naphthalenedi- carboxylic acid, H(2)L2=5-OH-1,3-benzenedicarboxylic acid, bbi=1,1-(1,4-butanediyl)bis(imidazole), phen=1,10-phenanthroline) have been hydrothermally synthesized and characterized by techniques of single crystal X-ray diffraction, infrared spectra, elemental analysis, powder X-ray diffraction, and variable-temperature magnetic susceptibility measurements. X-ray crystal structure analyses reveal that complex 1 exhibits 2D framework with 4-connected sql topology and is further extended into a 3D supramolecular architecture via strong O-HO and weak C-HO hydrogen-bonding interactions, while complex 2 features a 1D ladder-like chain with a 3-connected (4(2)6) topological structure. Magnetic studies showed the presence of an antiferromagnetic interaction between adjacent Co(II) ions in both complexes.
机译:具有配方的两种新型过渡 - 金属配位聚合物[CO(L1)(BBI)(H 2 O)](N)(1)和{[CO(L2)(Phen)] H 2 O}(N)(2)(H( 2)L1 = 1,4-萘二 - 羧酸,H(2)L2 = 5-OH-1,3-苯并二羧酸,BBI = 1,1-(1,4-丁二醇)双(咪唑),phen = 通过单晶X射线衍射,红外光谱,元素分析,粉末X射线衍射和可变温度磁性敏感测量,已经水热合成且其特征在于单晶X射线衍射,红外光谱,元素分析,粉射线衍射。 X射线晶体结构分析显示,复杂的1展示了具有4个连接的SQL拓扑的2D框架,并通过强大的O-HO和弱的C-HO氢键相互作用进一步扩展到3D超分子体系结构中,而复杂的2则具有1D梯子 - 用3连接的链式(4(2)6)拓扑结构。 磁性研究表明,两个复合物中相邻CO(II)离子之间的反铁磁相互作用存在。

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