SYNTHESIS AND LAXS INVESTIGATION OF SOME 1-(D-3-MERCAPTO-2-METHYLPROPIONYL)-L-PROLINE AMORPHOUS COMPLEXES WITH CO(II), NI(II), ZN(II), CD(II)

Four amorphous metal complexes with 1-(D-3-mercapto-2-methylpropionyl) -L-proline (L) with general formula Na2ML2 . nH2O (M = Co, n = 14; M = Ni, n = 4; M = Zn. n = 4; M = Cd. n = 7) have been synthesized. LAXS (large angle X-ray scattering) provided information on the local order around the metal(II) ions. A 2:1 ratio between ligand and all examine d metal ions was found. A tetrahedral configuration around zinc and ca dmium ions has been found with two sulphur and two amidic oxygen atoms bonded to the metals. For nickel and cobalt complexes an octahedral c onfiguration has been found with two water molecules bonded to the met al in axial position and two ligand molecules bonded via sulphur and a midic oxygen in equatorial position.