Synthesis and spectral investigations of Mn(II) complexes of pentadentate bis(thiosemicarbazones).
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.
Krishnan
Suja
S
Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682022, Kerala, India.
Laly
K
K
Prathapachandra Kurup
M R
MR
D004578:Electron Spin Resonance Spectroscopy; D008345:Manganese / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism*; D013055:Spectrophotometry, Infrared; D013882:Thiosemicarbazones / Q000138:chemical synthesis* / Q000737:chemistry*
D009942:Organometallic Compounds; D013882:Thiosemicarbazones; D008345:Manganese