Abstract
A new synthetic binuclear nickel(II) compound ([Ni-2(tacud)(2)(mu-H2O)(mu-Cl)(2)]Cl-2 (1); tacud= 1,4,8-triazacycloundecane) is reported. Compound 1 contains two Ni(II) ions bridged by two chloro and one aqua ligand resulting in a short Ni Ni distance of 3.0187(10) A. Each nickel is capped by terminal tacud ligands and possesses distorted octahedral geometry. This compound exhibits a new structural motif for metal complexes supported by tacud. Compound 1 exhibits two solvent dependent transitions in the UV-vis spectrum. Variable temperature SQUID magnetic susceptometry studies on 1 indicate mild ferromagnetism exists at room temperature (mu(eft)=4.78 mu(B)) which increases upon temperature lowering. Magnetic analysis of 1 in the temperature range 2-300 K confirm weakly ferromagnetic behavior with J = +2.28 cm(-1). (C) 2008 Elsevier B.V. All rights reserved.