Comparative Absorption Spectral Studies of Pr (III) with Hexafluoroacetylacetone complexes in various solvents

In the present study, the 4ƒ-4ƒ transitions of Pr(III) with hexafluoroacetylacetone [CF3COCH2COCF3] and their adducts with structurally related ligands o-phenanthroline [C12H12N2] and bipyridyl [C10H8N2] complexes in various solvents viz., methanol (CH3OH), acetonitrile [CH3CN] and dimethyl formamide [(CH3)2NCHO] have been successfully carried out. In the absorption difference and comparative absorption spectrophotometric study, the 4ƒ- 4ƒ transition spectra yield sharp bands which were analyzed individually by Gaussian curve analysis, energy interaction parameters (FK,EK), Lande spin orbit coupling (ξ4f), nephelauxetic ratio (β), bonding parameter (b1/2), percentage covalency (δ) and intensity parameters. By using partial multiple regression analysis method, these parameters were computed on computer to determine the possible geometry of complexes in solution and nature of the bond between lanthanide metal and ligands.

Author(s): Kiran Girdhar Chaudhari1 and Padmakar Arjun Savale2

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