STRUCTURE OF A ZINC(II) COMPLEX WITH A NONSYMMETRICAL TETRADENTATE SCHIFF-BASE

{N-[2-(2-Aminoethylamino)ethyl]salicyli-deneaminato-O,N,N'N"}aquazinc(II) bromide, [Zn(C11H16N3O)(H2O)]Br, M(r) = 369.57, monoclinic, P2(1)/c, a = 9.129 (1), b = 14.207 (1), c = 11.003 (1) angstrom, beta = 102.36 (1)-degrees, V = 1393.9 (2) angstrom 3, Z = 4, D(m) = 1.77 (1), D(x) = 1.76 Mg m-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 4.6 mm-1, F(000) = 744, T = 295 K, R = 0.030 for 1995 unique observed reflections. The crystal comprises a cationic Zn(II) complex which includes the saden ligand (saden = {N-[2-(2-aminoethylamino)-ethyl]salicylideneaminato-O,N,N',N"}) and a water molecule. The Zn atom is surrounded by three N and two O atoms (one from H2O) with a distorted trigonal bipyramidal arrangement. Intermolecular hydrogen bridges of the O(water)...O type join the molecules in dimers. Other than this, there is one Br...HO(water) and two Br...HN intermolecular distances, which correspond to hydrogen bonds much weaker than the O...O ones, in agreement with infrared spectra (nu-Br...DO = 2381 cm-1, nu-Br...DN = 2347 and 2326 cm-1).