A new polymorph of aqua­bis­(1,10-phenanthroline-κ(2) N,N′)copper(II) dinitrate

The title mol­ecule, [Cu(C(12)H(8)N(2))(2)(H(2)O)](NO(3))(2), is a new polymorph of a compound which up to now has been reported to crystallize space groups in C2/c and Cc. The crystal studied was twinned by non-merohedry (final BASF factor of 0.40043) with the structure being solved and refined in P-1. The Cu(II) atom is coordinated by four N atoms from two 1,10-phenanthroline ligands and an O atom from a water mol­ecule in an approximate trigonal–bipyramidal geometry. Discrete entities of one cation and two nitrate anions are formed by water–nitrate O—H⋯O hydrogen bonds. The components are further assembled into a three-dimensional network by C—H⋯O hydrogen bonds.