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2 Polish Journal of Chemistry

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Naphthylazo and Benzothiazolylazo Derivatives of Some Unsaturated beta-Diketones and Their Metal Complexes

Ummathur M. B.

Polish Journal of Chemistry

2009

Vol. 83, nr 10

1717-1728

Naphthylazo and benzothiazolylazo derivatives of three beta-diketones in which the diketo function is attached directly to olefinic link ages (dicinnamoyl methane, acetyl cinnamoyl methane and benzoyl cinnamoyl methane) have been synthesized and characterized. Analytical, IR, 1H NMR and mass spectral data indicate that the naphthylazo derivatives exist in the intramolecularly hydrogen bonded keto-hydrazone form and benzothiazolylazo derivatives in the intramolecularly hydrogen bonded azo-enol tautomeric form. In the [ML2] complexes [M = Ni(II), Cu(II), Zn(II)] the naphthylazo derivatives function as monobasic bidentate in which one of the hydrazone nitrogen and keto oxygen are involved in bonding with the metal ion. Monobasic tridentate coordination of the benzo -thiazolylazo derivatives in their [ML2] complexes has been established on the basis of analytical and spectral data.

9-Aryl-1,5-bis(N-phenylamino)-4,8-nonadiene-1,3,7-triones and Their Metal Complexes

Ummathur M. B., Krishnankutty K.

Polish Journal of Chemistry

2008

Vol. 82, nr 5

963-971

A new series of tricarbonyl compounds, in which the keto groups are at tached to olefinic linkages, have been synthesized by the reaction between acetoacetanilide and aromatic aldehydes (2-chlorobenzaldehyde, 4-chlorobenzaldehyde, 4-hydroxybenzaldehyde and vanillin) under specified conditions. Their IR, 1H NMR and mass spectral data revaealed that only one of the carbonyl groups is enolised and engaged in intramolecular hydrogen bonding. Neutral bidentate coordination of these compounds with Ni(II), Cu(II) and Zn(II) has been established on the basis of analytical and spectral data.