THE CRYSTAL AND MOLECULAR-STRUCTURE OF DIAQUABIS(L-LYSINO)NICKEL(II) DICHLORIDE MONOHYDRATE

The complex, diaquabis(L-lysino)nickel(II) dichloride monohydrate [Ni( C6N2O2H15)2(H2O)2]Cl2.H2O crystallizes in the triclinic space group P1 , with Z = 1. Cell dimensions are a = 9.802(1), b = 7.118(1), c = 8.53 3(1)angstrom, alpha = 79.47(1), beta = 112.27(1), gamma = 94.48(1)-deg rees. The structure was solved by the heavy atom method and was refine d to an R of 0.054 for 3689 observed reflections. The analysis shows t hat the Ni(II) ion has a distorted octahedral geometry. The alpha-amin o nitrogens and hydroxyl oxygens of lysine coordinate to Ni(II) to for m a square plane at distances between 2.025(2)angstrom and 2.100(2)ang strom. Water molecules approach the nickel apically at distances of 2. 144(4) and 2.153(3)angstrom, respectively. Chlorines lie outside the o ctahedron. Both lysine ligands have different conformations. The struc ture is connected by an elaborate network of hydrogen bonds and electr ostatic attractions.