Synthesis, crystal structure, and magnetism of a binuclear Cu(II) complex with double azido as asymmetric basal–apical end-on bridged ligand

Abstract

A new binuclear copper(II) complex, [Cu2(μ1,1-N3)2(PP)2)] ⋅ 2ClO4 (PP = 2,6-dipyrazol-1-yl-pyridine), was synthesized with double azide as asymmetric end-on bridge ligand and 2,6-dipyrazol-1-yl-pyridine as the terminal ligand. The crystal structure was determined by X-ray crystallography. Cu(II) is located in a distorted square pyramidal geometry, and azide bridges the equatorial-axial linking two Cu(II) atoms with a separation of 3.3595(11) Å. The fitting for the data of the variable-temperature (2–300 K) magnetic susceptibilities by using the Curie–Weiss law gives the Weiss temperature θ = −7.830 K, indicating a very weak anti-ferromagnetic interaction between the bridging Cu(II) complexes.