Complexation studies of N′-[(1E)-1-phenylethylidene]isonicotinohydrazide: An aroylhydrazone Schiff base and lanthanides

Add time:08/05/2019    Source:sciencedirect.com

The interaction of N′-[(1E)-1-phenylethylidene]isonicotinohydrazide (PHeH) with trivalent Pr, Nd, Gd, Tb, and Ho ions was studied with spectroscopic and potentiometric techniques. Photoluminescence studies of Tb3 + and PHeH in ethanol and in solid Tb3 +-PHeH complex reveal that PHeH has no sensitizing effect on Tb3 + luminescence. The absorption spectral bands of PHeH under different conditions and that of Nd3 +- PHeH at different molar ratios were investigated. Potentiometric titrations of 1:4 Ln/PHeH molar ratio carried out at different temperature at a constant ionic strength of I = 0.1 mol·dm− 3 KNO3 in aqueous-dioxane medium reveal the moderate thermodynamic stability constants of the complex formation equilibria which follow the order: Pr < Nd < Gd < Tb < Ho. The thermodynamic parameters (ΔG, ΔH, and ΔS) of protonation and complexation reactions are all negative suggesting the spontaneous, exothermic, of unfavorable entropy and enthalpy-driven reactions. Actual synthesis and characterization of Tb3 +-PHeH complex, confirmed the veracity of the complex formation equilibria. Finally, the information accrued from the studies is used in the structural elucidation of the complexes.

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