title: Synthesis, structure, magnetic properties and EPR spectroscopy of a copper(II) coordination polymer with a ditopic hydrazone ligand and acetate bridges.
abstract: A new one dimensional coordination polymer of copper(II), [Cu4(L)2(μ2-1,1-OAc)2(μ2-1,3-OAc)4]n (1), has been synthesized and characterized by spectroscopic methods and single crystal X-ray analysis [HL = (E)-N'-(phenyl(pyridin-2-yl)methylene)isonicotinhydrazide, OAc = acetate anion]. The coordination polymer contains two kinds of Cu(II) dimers which are connected by two types of acetate (μ2-1,1- and μ2-1,3-) bridging groups. The ditopic isonicotinhydrazone ligand coordinates to the Cu1 center through the N2O-donor set and connects to the Cu2 center by a pyridine group of the isonicotine part. The EPR and magnetic susceptibility measurements confirm the existence of two kinds of Cu(II) dimers. The intradimer isotropic exchange was estimated to be +0.80(1) cm(-1) for the ferromagnetic Cu1···Cu1 dimeric unit and -315 (1) cm(-1) for the antiferromagnetic Cu2···Cu2 dimeric unit.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Zanjan, 45371-38791, Zanjan, Iran. bikas_r@yahoo.com bikas@znu.ac.ir.
authors.forename: Rahman
authors.initials: R
authors.lastname: Bikas
authors.forename: Pavlo
authors.initials: P
authors.lastname: Aleshkevych
authors.forename: Hassan
authors.initials: H
authors.lastname: Hosseini-Monfared
authors.forename: Joaquín
authors.initials: J
authors.lastname: Sanchiz
authors.forename: Ritta
authors.initials: R
authors.lastname: Szymczak
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Lis