COBALT(II), NICKEL(II) AND ZINC(II) COMPLEXES OF 2-(DIPHENYLPHOSPHINYL)-2-PHENYL-ETHENOL

The cobalt(II), two different nickel(II) and zinc(II) complexes of 2-( diphenylphosphinyl)-2-phenyl-ethenol 1 (compounds 2-5) are synthesized and characterized by IR, electronic and EPR spectra as well as by mag netochemical methods. The complexation of 1 with the corresponding met al halides leads to L2M complexes (L = Ph2P(O)CPh = CHO 2: M = Co, 3: M = Ni, 4: M = Zn), where Co(II) and Ni(II) ions are in octahedral coo rdination. In the complex formed with nickel (II) acetate tetrahydrate the metal is coordinated by both phosphoryl and acetate group (5: LL' Ni, L' = CH3COO-) and on the base of mu(eff) tetrahedral coordination is suggested. According to the C-13 and (31)p Nh IR data the zinc com plex 5 is a mixture of (Z)- and (E)-isomers.