STUDY OF LIGAND ISOMERIC COMPLEXES OF N-FURFURYLSALICYLALDIMINE

The ligand isomeric complexes (OC4H3CH2NCHPhOH, A, and OC4H3CHNCH2PhOH, B) of N-furfurylsalicylaldimine with CoIII, NiII CuII, and PdII have been synthesised. The nature of the isomerism was characterised by the 1H n.m.r. spectral data for the azomethine group, CN group frequencies, and electric polarization. The complexes with VIVO, CrIII, MnII, FeIII, PtII, BeII, and ZnII were obtained in the A isomeric form. The 1H n.m.r. spectra of both the isomers of the cobalt(III) complexes indicated a trans configuration. An electric polarization study of nickel(II) complexes also suggested that both isomeric complexes had the trans configuration and that they were linkage isomers containing ligand isomers A and B. The participation of the furan oxygen in co-ordination was indicated in the A isomeric form of complexes with PdII and ZnII. The characterisation of the isomers was supplemented by u.v. spectra.