3 research outputs found
Heteroarylazo derivatives of cyclohexane-1,3-dione and their metal complexes
The coupling of diazotized 2-aminothiazole and 2-aminobenzo-thiazole with
cyclohexane-1,3-dione yielded a new type of tridentate ligand systems (HL).
Analytical, IR, 1H NMR, 13C NMR and mass spectral data indicate the existence
of the compounds in the intramolecularly hydrogen bonded azo-enol tautomeric
form. Monobasic tridentate coordination of the compounds in their [CuL(OAc)]
and [ML2] complexes [M = Ni(II) and Zn(II)] has been established on the basis
of analytical and spectral data. The Zn(II) chelates are diamagnetic while
Cu(II) and Ni(II) complexes showed normal paramagnetic moment
Unsaturated b-ketoesters and their Ni(II), Cu(II) and Zn(II) complexes
A new series of b-ketoesters in which the keto group is attached to the olefinic linkage were synthesized by the reaction of methyl acetoacetate and aromatic aldehydes under specified conditions. The existence of these compounds predominantly in the intramolecularly hydrogen bonded enol form was well demonstrated from their IR, 1H-NMR and mass spectral data. Details on the formation of their [ML2] complexes with Ni(II), Cu(II) and Zn(II) and the nature of the bonding are discussed on the basis of analytical and spectral data