Preparation and X-ray crystal structure of bis(1,8-naphthyridine-N-monoxide)copper(II) nitrate

Abstract The title compound Cu(napyo) 2 (NO 3 ) 2 was formed by the reaction of copper(II) nitrate with 1,8-naphthyridine-N-monoxide (napyo) in methanol. The complex crystallizes in the monoclinic space group P 2 1 / n with Z = 2, a = 7.768(2), b = 13.976(2), c = 9.045(3) A, β = 113.12(3)°. The structure was determined from 1579 observed reflections and refined to R = 0.035. The copper atoms show a tetragonally distorted octahedral configuration, being bonded to two oxygen atoms (CuO, 1.951 A) and two nitrogen atoms (CuN, 1.963 A) of the two napyo ligands and to two oxygen atoms (CuO, 2.410 A) of two nitrate groups.