DETERMINATION OF THE PROTONATION CONSTANTS OF 2-[4-DIMETHYLAMINOCINNAMALAMINO] BENZOIC-ACID (DACAB) IN DIOXANE - WATER MEDIUM AND PREPARATION OF SOME OF ITS TRANSITION-METAL COMPLEXES

In this study, the Schiff base 2-[4-Dimethylaminocinnamalamino]- benzo ic acid [(CH3)(2)N . C6H4. CH: CH . N . C6H4. COOH] (DACAB) was prepar ed by the reaction of 2-Aminobenzoic acid with p-Dimethylaminocinnamal dehyde. The protonation constants of the ligand were determined in a 5 0% (v/v) dioxane - water medium using the Irving-Rossotti and PKAS-BES T computer methods. The complexes of Fe(III), Co(II), Ni(II), Cu(II) w ith DACAB were synthesized and the structures of these complexes were elucidated by means of data obtained from elemental analysis, using IR , H-1-NMR methods. The magnetic properties of the solid complexes were measured.