title: An unsymmetrical tripodal ligand with NOS2-donor set: coordination chemistry with nickel(II) and zinc(II).
abstract: The synthesis of the novel tripodal ligand [N(CH2CH2CH2OH)(CH2CH2SH)2] H3-4 is reported. The aliphatic tetradentate ligand is equipped with an unsymmetrical NOS2 donor set. It reacts with Ni(OAc)2 x 4H2O or Zn(BF4)2 x xH2O to give the complexes [Ni(H-4)]2 5 and [Zn(H-4)]4 6, respectively. The molecular structures of 5 and 6 have been determined by X-ray diffraction. In both cases multinuclear, mu-thiolato-bridged complexes, wherein the ligand coordinates with only three (NS2) of the four donor groups, had formed. The dinuclear complex 5 adopts a butterfly geometry and contains nickel(II) ions in a square-planar NS3 coordination environment. Cyclic voltammetry experiments indicate that the nickel centers in 5 are electron-rich but not overly sensitive toward oxidation. Complex 6 is tetranuclear and the four thiolato-bridged metal centers form a ring. It shows a distorted tetrahedral coordination geometry for the zinc(II) ions in an NS3 coordination sphere. In both complexes the hydroxyl functionalized ligand arm of the tripodal ligand remains uncoordinated.
authors.affiliation: Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Wilhelm Klemm-Strasse 8, 48149 Münster, Germany. fehahn@uni-muenster.de
authors.forename: F Ekkehardt
authors.initials: FE
authors.lastname: Hahn
authors.forename: Christian
authors.initials: C
authors.lastname: Ochs
authors.forename: Thomas
authors.initials: T
authors.lastname: Lügger
authors.forename: Roland
authors.initials: R
authors.lastname: Fröhlich