Bis(pentafluorophenyl) complexes of nickel(II) with O,O- and O,N-donor ligands

Several new bis(pentafluorophenyl) nickel (II) complexes with O,O- and O,N- donor ligands were prepared by directly reacting the hydroxo-complex [{Ni(C 6F5)(2)(mu-OH}(2)](2-) with the protic acids oxalic (H2oX), glycine (Hgly), picolinic (Hpic), 2-aminobenzoic (Hambz), acetohydroxamic (Haha) and benzo hydroxamic (Hbha) to give the mu-oxalate and mononuclear anionic complexes [Ni(C6F5)(2)L)(2)(L-L)](-) (L-L = O-O or O-N ligand). Reaction of the di-mu -hydroxo precursor with monooximes of diacetyl (Hdamo), benzyl (Hdbmo), 2-a cetylpyridine (Hapmo) and 2-benzylpyridine (Hbpmo) also yielded the expecte d pentafluorophenyl derivatives [Ni(C6F5)(2)(L-L)](-). All the complexes ha ve been characterized by partial elemental analyses, conductance measuremen ts, and spectroscopic (IR, and H-1 and F-19 NMR) methods. (C) 2000 Elsevier Science S.A. All rights reserved.