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The crystal structure of the title compound, [Cu(C(4)H(10)N(5))(2)].H(2)O, contains two independent copper N,N-dimethylbiguanide complex units, each with square-planar coordination of the Cu atom by four N atoms. The two complexes have different symmetry, with one Cu atom lying on an inversion centre and the other on a twofold rotation axis. The Cu-N bond lengths are 1.923 (2) and 1.950 (2) A in the centrosymmetric complex, and 1.928 (2) and 1.938 (2) A in the non-centrosymmetric complex. The crystal structure is stabilized by N-H...O, O-H...N and N-H...N hydrogen bonds; each water molecule forms four hydrogen bonds involving three different Cu complexes.

Key indicatorsSingle-crystal X-ray study T = 173 K Mean '(C±C) = 0.005 A Ê R factor = 0.045 wR factor = 0.115 Data-to-parameter ratio = 11.0For details of how these key indicators were automatically derived from the article, see

In the title compound, C15H14BrNO2, the 4-bromo­phenyl fragment makes a dihedral angle of 76.55 (17)° with the acetamide unit and the dihedral angle between the two benzene rings is 50.88 (14)°. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds and C—H⋯π contacts connect the mol­ecules, forming chains propagating in [100].