Aqua(4,7-diphenyl-1,10-phenanthroline)-(salicylaldehydato)copper(II) nitrate monohydrate

Each Cu-II ion in the title compound, aqua(4,7-diphenyl-1, 10-phenanthrolin e-N,N')(2-formylphenolato-O,O') copper(II) nitrate monohydrate, [Cu(C7H5O2) (C24H16N2)(H2O)]NO3. H2O, displays a slightly distorted square-pyramidal co ordination site where the O atom from one water molecule is in the apical p osition [at 2.306 (4) Angstrom], and both the O atoms [at 1.970 (3) and 1.9 39 (3) Angstrom] of the salicylaldehydate and the N atoms [at 1.994 (3) and 1.998 (2) Angstrom] of the phenanthroline molecule define its base. The fi ve-membered chelate ring formed by the phenanthroline ligand and the Cu ato m is roughly planar, while the chelate ring formed by the salicylaldehydate ligand and the Cu atom is planar, with a slight distortion towards an enve lope conformation. Hydrogen bonding and pi-pi* orbital interactions seem to determine the crystal packing. The complex is cationic and the nitrate ion is not coordinated.