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: [Cu 2(μ-NCO- N, N′) 2(NCO- N) 2(dpyam) 2

Abstract

A new dinuclear copper(II) complex [Cu 2(μ 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 ⊥ = 2.08 and an unresolved g ∥ of 2.29.