Structure and chemical properties of a copper(II) hydrazido complex: [{Cu(HB(3,5-iPr2pz)3)}2(μ-NCOOEt)2]

The novel copper(II) hydrazido(2−) complex ligated by hydrotris(pyrazolyl)borate was synthesized to obtain insight into the copper coordination chemistry in the presence of diazene and hydrazine ligands. The structure of [{Cu(L1)}2(μ-NCOOEt)2] was determined by X-ray crystallography, where L1 = hydrotris(3,5-diisopropyl-1-pyrazolyl)borate anion, and along with spectroscopic characterization, e.g. UV–Vis and ESR, prove the presence of copper(II) centers.