通过 α,α'-二羟基联苯-4,4'-二甲酸的配位聚合物中的三重氢键实现的铁磁相互作用。

Ferromagnetic interactions through triple hydrogen bonds in the coordination polymers of alpha,alpha'-dihydroxy-bibenzyl-4,4'-dicarboxylate.

机构信息

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai, 200062, China.

出版信息

Dalton Trans. 2010 Apr 14;39(14):3521-6. doi: 10.1039/b925212f. Epub 2010 Mar 8.

DOI:10.1039/b925212f

PMID:20333341

Abstract

Three transition metal coordination polymers with alpha,alpha'-dihydroxy-bibenzyl-4,4'-dicarboxylate (L) were synthesized, and structurally and magnetically characterized. The three compounds, formulated as [M(L)(H(2)O)(4)].2H(2)O (M = Co(ii), Mn(ii) and Ni(ii)), are isomorphic and consist of one-dimensional coordination chains formed by the dicarboxylate ligand bridging the metal ions using monodentate carboxylate groups. Intriguingly, the [M(COO)(2)(H(2)O)(4)] spheres from different coordination chains are linked through triple O-H...O bridges to give the rare hydrogen bonded chains with [M(O-H...O)(3)M] helicate motifs, which represent good systems suitable for investigating the exchange coupling through hydrogen bonding. Magnetic studies on Ni(ii) and Co(ii) compounds reveal that the triple hydrogen bonding bridge transmits ferromagnetic coupling, with J = 3.46 cm(-1) for the Ni(ii) compound and J = 1.12 cm(-1) for the Co(ii) compound.

摘要

合成了三种具有α,α'-二羟基联苯-4,4'-二甲酸酯（L）的过渡金属配位聚合物，并对其进行了结构和磁性表征。这三种化合物的化学式为[M(L)(H2O)4].2H2O（M=Co(ii), Mn(ii) 和 Ni(ii)），它们是同构的，由一维配位链组成，其中二羧酸配体通过单齿羧酸盐基团桥连金属离子。有趣的是，来自不同配位链的[M(COO)2(H2O)4]球体通过三重 O-H…O 桥连接，形成了罕见的氢键链，其中具有[M(O-H…O)3M]螺旋构象，这代表了适合研究氢键通过交换耦合的良好体系。对 Ni(ii)和 Co(ii)化合物的磁性研究表明，三重氢键桥传递铁磁耦合，Ni(ii)化合物的 J = 3.46 cm-1，Co(ii)化合物的 J = 1.12 cm-1。