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 [Cu2(μ1,1-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.