Synthesis and characterization of divalent manganese,cobalt, nickel,copper and zinc complexes with nicotinic acid |
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Authors: | Raghuvir Singh RSSreenivas Rao |
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Institution: | School of Chemistry, University of Hyderabad, Hyderabad 500001 India |
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Abstract: | Coordination compounds of the transition metal(II) acetylacetonates of the formula M(NA)2(acac)2 ]n (M = Mn, Co, Ni, Cu and Zn; NA = nicotinic acid and acac = acetyl-acetonate anion) have been synthesized and characterized by chemical analysis, magnetic susceptibility, ligand-field spectra, IR and far-IR spectral measurements as well as photoacoustic spectroscopy in the solid state. Tentative stereochemistries for the complexes isolated in the solid state are suggested. The ligand-field parameters 10 Dq, B, β, λ and CFSE are calculated for cobalt and nickel complexes and are in good agreement with the proposed geometries. The metal ions attain six-coordination through the four oxygens of the anion and two donor atoms of the nicotinic acid ligands acting always as monodentate ligands. The formation of the compound results in a considerable shift of v(M-O) to lower frequencies in all the compounds related to parent acetylacetonates. |
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