The crystal structure of the [Cu(Proma)(Im)] . H2O coordination compound (where Proma(2-) is an S-proline-N-monoacetate dianion and Im is imidazole) is studied by X-ray diffraction. The crystals are orthorhombic, a = 8.286 Angstrom, b = 8.546 Angstrom, c = 17.309 Angstrom, Z = 4, and space group P2(1)2(1)2(1). The structural units of the crystal are the [Cu(Proma)(Im)] molecular complexes and crystallization water molecules. The square coordination of the Cu atom involves O atoms of two acetate groups (Cu-O, 1.958 and 1.955 Angstrom) and N atoms of the Proma and Im ligands (Cu-N, 1.986 and 1.958 Angstrom). The terminal O atoms of the neighboring complexes complete the Cu coordination polyhedron to a 4 + 1 + 1 square bipyramid (Cu-O, 2.578 and 2.783 Angstrom) and form a framework structure. The hydrogen bonds involving oxygen atoms of the Proma ligand, water molecules, and an uncoordinated nitrogen atom of the Im ligand contribute to the strengthening of the framework. (C) 2004 MAIK "Nauka/Interperiodica".
