Crystal structure and spectra of (2,9-dimethyl-1,10-phenanthroline) 2,2,6,6-tetramethyl-3,5-heptanedionato copper(II) nitrate

Abstract

Abstract The title compound (C25H31N3O5Cu) is monoclinic, with space group P21/c, Z = 4 and cell dimensions a = 9.5077(10), b = 9.8105(14), c = 27.123(4) Å and β = 91.315(13). A total of 7833 reflections were measured on a Philips PW1100 automatic diffractometer using MoKα radiation. The structure was refined by full-matrix least-squares to a conventional R = 0.0496 for the 3648 unique reflections. The co-ordination around the central copper atom is square pyramidal with the copper atom 0.177(2) Å above the base plane of three oxygen and one nitrogen atoms. The Cu–O bond lengths have a mean value of 1.956 Å, whereas the Cu–N bond length is 2.030 Å. The apex of the pyramid is occupied by the second nitrogen atom of neocuproine at a distance of Cu–N = 2.266 Å.