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Two new Schiff bases containing olefinic linkages have been synthe- sized by condensing aliphatic diamines with dicinnamoylmethane under speci- fied conditions. The existence of these compounds predominantly in the intra- molecularly hydrogen bonded keto-enamine form was well demonstrated by their IR, 1H-NMR and mass spectral data. Dibasic tetradentate N2O2 coordi- nation of the compounds in their (ML) complexes (M = Ni(II), Cu(II) and Zn(II)) was established on the basis of analytical and spectral data.

Metal complexes of Schiff bases derived from dicinnamoylmethane and aliphatic diamines