COORDINATION SELECTIVITY AND LIGAND SUBSTITUTION REACTIONS OF AN ALUMINUM(III) COMPLEX WITH 8-HYDROXY-7-[(2 ' -CARBOXY-1 ' -PHENYL)-AZO]QUINOLINE-5-SULFONIC ACID

Abstract The coordination behavior of aluminum(III) with 8-hydroxy-7-[(2 ' -carboxy-1 ' -phenyl)azo]quinoline-5-sulfonic acid (H3pqs) was examined. This quinolinol derivative functions as a terdentate ligand of the O-N-O type to form mono- and bis-(O-N-O) complexes by way of the reaction of [Al(H2O)6]3+ with Hpqs2- and pqs3- and of [Al(OH)(H2O)5]2+ with H2pqs− and Hpqs2-. The ligand substituion reaction of [Al(pqs)2]3- with 8-quinolinol-5-sulfonic acid was also studied in connection with its reaction mechanism.