Crystal structure of bis-(pivaloyl-hydroxamato-κ 2 O , O ')copper(II).

Reaction of copper(II) nitrate with pivaloyl-hydroxamic acid yielded the title compound, [Cu(pivHA)2 ] (where pivHA- is pivaloyl hydroxamate, C5 H10 NO2 ). The centrosymmetric mononuclear complex consists of a CuII ion, which is located on a center of inversion, with two coordinated pivaloyl hydroxamate monoanions. The CuII ion has a square-planar coordination environment consisting of four O atoms - two carbonyl O atoms and two hydroxamate O atoms from two hydroxamate pivHA- ligands. The pivHA- anions are coordinated to copper(II) in a trans -mode, forming two five-membered O , O '-chelate rings.