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Diammine-(o-phthalato)copper(II), Cu(NH3)zCaH404, is monoclinic, P21/c: a=6"64 (1), b= 19-91 (1), c= 7"55 (1) A, fl= 109.9 (.1), Z= 4. The crystal structure has been determined from three-dimensional X-ray photographic data and refined by differential methods with anisotropic parameters to a final R value of 7"7%. The coordination around the metal atom is nearly square planar and involves two oxygen atoms from different phthalate ions and two nitrogen atoms from ammonia molecules [Cu-O 1-988 (5), 1.971 (5); Cu-N 1.992 (6), 1.997 (8) A]. Two more oxygen atoms, trans with respect to the coordination plane, make two long contacts [Cu-O 2.313 (5), 2.799 (5)/~] so the coordination polyhedron can be considered also a distorted bipyramid. Two of these bipyramids are coupled along an O-• • O edge and the couples are linked in chains by phthalate bridges. Both carboxyl groups are slightly rotated with respect to the benzene ring in the same direction. Packing is determined by a set of hydrogen bonds involving the nitrogen atoms from ammonia molecules and the oxygen atoms from the carboxyl groups.

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