Acta Cryst. (2012). E68, i89-i90
[ doi:10.1107/S1600536812045382 ]

Poly[diamminedi-₃-dicyanamido-copper(II)]

J. G. Díaz, A. G. Albor, E. V. Jaime, V. Vrábel and J. Kozísek

Abstract: The asymmetric unit of the title polymeric mononuclear Cu^II complex, [Cu(C₂N₃)₂(NH₃)₂]_n, contains one half-molecule, the complex being completed through inversion symmetry, with the Cu^II atom situated on the centre of symmetry. The coordination polyhedron around Cu^II is a Jahn-Teller-distorted [CuN₆] octahedron. The terminal N atoms of two dicyanamide ligands and two ammine ligands form an approximate square plane, with N-Cu-N bite angles of 89.72 (5) and 90.28 (5)°. The coordination polyhedron is completed in the axial positions by the central amide-type N atoms of two additional dicyanamide ligands, with an elongated Cu-N distance of 2.548 (1) Å. In turn, each of the four dicyanamide ligands, acting as bidentate, link the Cu^II ions into a two-dimensional polymeric structure parallel to (100). The ammine H atoms are involved in intermolecular hydrogen bonding with the free terminal N atoms of neighbouring dicyanamide ligands, yielding a three-dimensional network.

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