4.5 Article

Transition metal complexes of 2-formylpyridinethiosemicarbazone (HFpyTSC) and X-ray crystal structures of [Pd(FpyTSC)(PPh3)]PF6 and [Pd(FpyTSC)(SCN)]

Journal

INORGANICA CHIMICA ACTA
Volume 363, Issue 11, Pages 2526-2532

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2010.04.018

Keywords

Palladium; Rhodium; Thiosemicarbazone; Molecular spectra; X-ray crystallography

Funding

  1. NSERC (Canada)
  2. Minsitry of Higher Education, Egypt

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The syntheses of five new complexes of the 2-formylpyridinethiosemicarbazone ligand (HFpyTSC) with Pd(II) and Rh(III) ions are described, viz., [Pd(FpyTSC)(PPh3)]PF6, [Pd(FpyTSC)(SCN)], [Pd(FpyTSC)Br], [Pd(HFpyTSC)(2)]Br-2 and [Rh(FpyTSC)(PPh3)(2)Cl]ClO4. The formulation of the complexes is discussed in terms of their elemental analyses and IR, Raman, NMR (H-1, C-13 and P-31), mass and electronic spectra. The X-ray crystal structures of [Pd(FpyTSC)(PPh3)]PF6 and [Pd(FpyTSC)(SCN)] show that the HFpyTSC ligand coordinates to the central Pd(II) ion in a planar conformation through the pyridyl nitrogen, the azomethine nitrogen and the deprotonated thiol sulphur atom. Thus, HFpyTSC is a versatile ligand that usually acts as a mononegative tridentate ligand bonding through N-py, N-C=N and C-S while, in the case of [Pd(HFpyTSC)(2)]Br-2, it behaves as a neutral bidentate ligand via N-C=N and C=S. (C) 2010 Elsevier B.V. All rights reserved.

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