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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. Khedra*, Raafat M. Issaa , Adel Z. El-Sonbatib, Abdalla Abdel-Gawadb  
     
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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