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|Title:||Heterobi nuclear cobalt-oxomoI ybdenumthiocyanate complexes of dithiocarbamates or 8-quinolinol|
Nagaraja, K S
|Abstract:||The heterobinuclear complexes of [CoMoO2(NCS)(L)3(H2O)](L=diethyldithiocarbamate, 4-morpholinyldithiocarbamate or 8- quinolinol) are prepared by the interaction of ammonium molybdate with ammonium thiocyanate in the presence of hydrazinium sulphate and cobalt (II) nitrate with the respective ligands in DMF. The magnetic moment, EPR and PES data suggest the presence of molybdenum(V) and low-spin cobalt(III).The crystal field splitting parameters have been evaluated from the electronic spectral data. The infrared spectra suggest the presence of N-bonded thiocyanate ligand (2040 and 780 cm-1)dithiocarbamate ligands (1500 and 960 cm-l) and (Mo=O) (910cm-l) in the molecule. The extensive splitting in each peak observed in the 1H NMR spectra of the complexes indicate the restricted rotation of the alkyl side chain of the bidentate dithiocarbamate groups. The redox behaviour of the complexes in DMF is discussed from the cyclic voltammetry data. The thermal decomposition and infrared spectral studies confirm the presence of coordinated water molecule. The proposed structure consists of an octahedral cobalt(III) and an octahedral oxomolybdenum(V) bridged by an oxo and a thiocyanate groups.|
|Appears in Collections:||IJC-A Vol.42A(08) [August 2003]|
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