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Synthesis and spectral investigations of Mn(II) complexes of pentadentate bis(thiosemicarbazones)

Authors
Publisher
Elsevier B.V.
Publication Date
Volume
75
Issue
2
Identifiers
DOI: 10.1016/j.saa.2009.11.022
Keywords
  • 2
  • 6-Diacetylpyridine
  • Bis(Thiosemicarbazones)
  • Manganese(Ii) Complexes
  • Epr Studies
Disciplines
  • Physics

Abstract

Abstract Five Mn(II) complexes of bis(thiosemicarbazones) which are represented as [Mn(H 2Ac4Ph)Cl 2] ( 1), [Mn(Ac4Ph)H 2O] ( 2), [Mn(H 2Ac4Cy)Cl 2]·H 2O ( 3), [Mn(H 2Ac4Et)Cl 2]·3H 2O ( 4) and [Mn(H 2Ac4Et)(OAc) 2]·3H 2O ( 5) have been synthesized and characterized by elemental analyses, electronic, infrared and EPR spectral techniques. In all the complexes except [Mn(Ac4Ph)H 2O], the ligands act as pentadentate neutral molecules and coordinate to Mn(II) ion through two thione sulfur atoms, two azomethine nitrogens and the pyridine nitrogen, suggesting a heptacoordination. While in compound [Mn(Ac4Ph)H 2O], the dianionic ligand is coordinated to the metal suggesting six coordination in this case. Magnetic studies indicate the high spin state of Mn(II). Conductivity measurements reveal their non-electrolyte nature. EPR studies indicate five g values for [Mn(Ac4Ph)H 2O] showing zero field splitting.

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