| 20018556 |
Krishnan S, Laly K, Prathapachandra Kurup MR: Synthesis and spectral investigations of Mn (II) complexes of pentadentate bis (thiosemicarbazones). Spectrochim Acta A Mol Biomol Spectrosc. 2010 Feb;75(2):585-8. Epub 2009 Nov 18.
Five Mn (II) complexes of bis (thiosemicarbazones) which are represented as [Mn (H (2) Ac4Ph) Cl (2)] (1), [Mn (Ac4Ph) H (2) O] (2), [Mn (H (2) Ac4Cy) Cl (2)].H (2) O (3), [Mn (H (2) Ac4Et) Cl (2)].3H (2) O (4) and [Mn (H (2) Ac4Et)(OAc)(2)].3H (2) O (5) have been synthesized and characterized by elemental analyses, electronic, infrared and EPR spectral techniques. In all the complexes except [Mn (Ac4Ph) H (2) O], 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 (2) O], 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 (2) O] showing zero field splitting. |
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