Abstract

DETERMINATION OF STOICHIOMETRIC RATIOS FOR THE COMPLEXES DERIVED SOME AROMATIC HYDROXYL IMINES OF PARA-AMINO BENZALDEHYDE WITH DIAZOTIZED PARA-NITRO ANILINE REAGENT

Mohammad Mahmoud Hussein Al-Niemi and Ahmed Qassim Hassan AL-windawi*

ABSTRACT

A spectrophotometric method is used for the evaluated of the stoichiometry of a yellow coloured azo imine complexes at different pH. These complexes are formed by the reactions of donor molecules as 4-(di methyl benzylidene aniline and its substituents ortho, meta and para hydroxy with diazotized para nitro aniline molecule as an electron acceptor. A mole ratio method is applied to investigate the stoichiometry of the coloured azo imine complexes which are found to be of 1:1 types. Finally, it was concluded that stoichiometry of the produced coloured azo imine complexes did not depend on the pH of the medium when it is acidic, neutral and basic or at pH values 5, 7 and 9 respectively and on the hydroxyl group position of imines under study.

Keywords: Dye, Schiff base, Complex azo imine, Spectrophotometry.