Synthesis and Characterisation of Some Novel Ni(II) Complexes with Dithiocarbamate Ligand at different pH
Keywords:
Dithiocarbamate, pH dependent coordination behaviour, spectroscopic studies, monoanionic bidentate ligand.Abstract
Some novel complexes of Ni(II) with 5-cyano-3-formyl-1H- indole-1-dithiocarbamate ion (L) have been synthesised in acidic (pH=2.0), neutral (pH=7.0) and alkaline (pH=10.0) media to investigate the pH dependent coordination behaviour of the ligand. The complexes have been characterised on the basis of elemental analysis, molar mass determination, molar conductance and magnetic moment measurements, uv and IR spectroscopic studies. Complexes synthesised in acidic and neutral media have been formulated as [Ni(L)2(H2O)2] while that synthesised in alkaline medium is formulated as [Ni(L)2(NH3)2]. All the complexes are non- electrolytes as their molar conductance values fall in the range 18-24ohm–1cm2 mol–1. They are found to be paramagnetic with octahedral geometry. The ligand behaves as monoanionic bidentate ligand and its coordination behaviour is found to be independent of the pH of the reaction medium.
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