Synthesis and Spectroscopic Studies of Some Novel 4-Substitued f3-Diketo-Anils in Free and in Coordinated Forms

Abstract

The Schiff bases of activated anilines with p-diketone have been synthesized. The electron donating effects of methyl, methoxy and chloro groups, before and after coordination, were studied with the help of vibrational spectra and supported by UV-vis studies. In these p-diketo-anils and their complexes, instead of a band in the region 1590-1620 cm-1 for C=N group, bands in the regions 1100-1300 cm' and 3100-3300 cm-1 were observed and were assigned to C-N and N-H bonds. No significant band appeared for C=N in any of these ligands either in free or in coordinated forms. It was concluded that unlike other aldehydes and ketones, f3-diketone upon reacting with anilines form C=C-N-H bonding instead of producing C=N functional group.