Synthesis, crystal structure and magnetic properties of an octacyanometallate-based 3-D Cu-II-W-IV bimetallic assembly

摘要

The three-dimensional cyano-bridged bimetallic coordination polymer, [Cu(L)](2)[W(CN)(8)]-4H(2)O (L = 3,10-diethanol-1,3,5,8,10,12-hexaaza-cyclotetradecane) 1, has been synthesized and characterized. X-ray study shows that the asymmetric unit of the three-dimensional Cu(II)-W(IV) polymeric assembly consists of four crystallized water molecules, two [Cu(L)](2+) cations and one [W(CN)(8)](4-) anion. The Cu-II centers in compound I exhibit elongated octahedral geometries, while the W-IV centers adopt distorted square antiprism geometries. Each W-IV coordinated via four cyano groups to four Cull. The structure of compound I can be described as an infinite 3-D assembly of W center dot center dot center dot Cu center dot center dot center dot W linkage. The thermal and magnetic behavior of this compound has been investigated. Variable-temperature magnetic susceptibility measurements reveal that there is a weak antiferromagnetic interaction between the Cull centers in compound 1. (C) 2006 Elsevier B.V. All rights reserved.