Synthesis, spectroscopic characterization, X-ray crystal structure and magnetic properties of dinuclear copper(II) complex with dual end-to-end and end-on cyanate bridges:: [Cu2(μ-NCO-N,N′)2(NCO-N)2(dpyam)2]

A new dinuclear copper(II) complex [Cu-2(mu(1),(1)-NCO)(2)(NCO)(2)(dpyam)(2)] (dpyam = di-2-pyridylamine) has been synthesized and characterized by X-ray diffraction. Two N-bonded cyanato ligands bridge two copper ions in an end-on fashion and two others act as the N-bonded terminal ligands. The copper ion has a distorted square-pyramidal environment. The magnetic susceptibility, measured from 5 to 300 K, has revealed a weak ferromagnetic interaction between the Cu(II) atoms with a singlet-triplet energy gap (J) of 6.03 cm(-1). The EPR spectrum, measured as a powdered solid at RT and 77 K, shows an S = 1/2 signal with g(perpendicular to) = 2.08 and an unresolved g(parallel to) of 2.29. (c) 2005 Elsevier B.V. All rights reserved.