Cation-specific and anion-specific Abraham Model correlations for solute transfer into ionic liquid solvents

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	Global Journal of Analytical Chemistry. Volume 1, Issue 1 (2010) pp. 68-79
	Research Article

	Spectrophotometric and analytical characteristics of 5-(4-X-phenyl)-azo-8-hydroxy quinolines and their complexes with La(III), Ce(III), Pr(III), Zr(IV), Hf(IV) and Th(IV) ions
	Abdalla M. Khedr^a*, Raafat M. Issa^a , Adel Z. El-Sonbati^b, Abdalla Abdel-Gawad^b

	a Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt ^b Chemistry Department, Faculty of Science, Demiatta University, Demiatta, Egypt

	Abstract
	The UV-Vis spectra of 5-(4-X-phenyl)-azo-8-hydroxyquinoline derivatives (X = OCH₃; CH₃ ; H; SO₃H; NO₂ ) are investigated in ten organic solvents of different polarity in order to through light on their solvatochromic behavior. An interesting discussion for the effect of the substituent (X) and hydrogen bonding on the energy of the charge transfer transitions and proton-ligand dissociation constants of the investigated compounds is introduced on the basis of electron – repelling property. The different factors affecting the formation of La³⁺, Ce³⁺, Pr³⁺, Zr⁴⁺, Hf⁴⁺ and Th⁴⁺ complexes with the ligands under interest have been studied. The spectrophotometric and analytical characteristics of the formed complexes are determined.

	Keywords
	Quinoline azo dyes; Metal complexes; Spectral and analytical characteristics

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