Schiff bases of 3-(2-thiazolylazo)-2,4-pentanedione with aliphatic diamines and their metal complexes

Department of Chemistry, University of Calicut, Calicut-673 635, Kerala, India

Department of Chemistry, NSS College, Manjeri-676 122, Kerala, India

Department of Chemistry, Unity Women's College, Manjeri-676 122, Kerala, India

E-mail : mbummathur@rediffmail.com

Manuscript received 23 July 2007, revised 8 October 2007, accepted 12 October 2007

Reaction of aliphatic diamines [1,2-diaminoethane, 1,3-diaminopropane and 1,6-diaminohexane] with 3- (2-thiazolylazo)-2,4-pentancdione yielded a new series of polydentate Schiff base ligands. The existence of these compounds predominantly in the intramolecularly hydrogen bonded keto-imine form has been well demonstrated from their analytical, IR, ¹H NMR and mass spectral data. Dibasic tetradentate N₄ coordination of the compounds in their [ML] complexes [M = Ni^II , Cu^II and Zn^II] has been established on the basis of analytical and spectral data.