Studies on the complexation of neodymium(III) ion with 1,2,4-1H-triazole and 1,2,3-benzotriazole in absence and presence of calcium(II) ion in aqueous and some selected different aquated organic solvents by an absorption spectroscopy involving 4f–4f trans

The absorption spectra of trivalent neodymium ion with 1,2,4-1H-triazole and 1,2,3-benzotriazole in absence and presence of calcium(II) ion in aqueous and some selected different aquated organic solvents have been recorded in the visible and near infrared regions. From the data available in the absorption spectra, various spectroscopic parameters such as Slator–Condon (Fk), Lande spin–orbit coupling constant (ξ4f), nephelauxetic ratio (β), bonding parameter (b1/2), percent covalency (δ), oscillator strength (P) and Judd–Ofelt intensity (Tλ) parameters have been evaluated. The Judd–Ofelt intensity, Tλ (λ = 2, 4, 6) parameters are utilized in evaluating the Pcal from various excited states of trivalent neodymium ions and ratifying as an inner sphere complexations.

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► Coordination behavior of Nd(III) with 1,2,4-1H-triazole and 1,2,3-benzotriazole.
► Existence of inner sphere complexes.
► Percent covalency of the complexes.
► Evidence of the solvent interaction with the metal ion.