ic0491940_si_002.cif (26.7 kB)
An Unsymmetrical Tripodal Ligand with NOS2-Donor Set: Coordination Chemistry with Nickel(II) and Zinc(II)†
dataset
posted on 2004-09-20, 00:00 authored by F. Ekkehardt Hahn, Christian Ochs, Thomas Lügger, Roland FröhlichThe 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)2·4H2O or Zn(BF4)2·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, μ-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.
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NS 2Unsymmetrical Tripodal LigandNOS 2OHaliphatic tetradentate ligandligand coordinatestetrahedral coordination geometryH 3ZnComplex 6nickel centersNiCHCyclic voltammetry experimentshydroxyl functionalized ligand armbutterfly geometrySHcases multinuclearunsymmetrical NOS 2 donornovel tripodal ligandcomplexNS 3 coordination spheretripodal liganddonor groups
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