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The title compound (C 25 H 31 N 3 O 5 Cu) is monoclinic, with space group  P 2 1 / 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 Mo Kα  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.

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