CIRCULAR-DICHROISM STUDIES OF METAL-COMPLEXES WITH A CHIRAL SCHIFF-BASE - RR-TRANS-N,N-CYCLO HEXANE-BIS (1-PHENYL-5-IMINO-1,3-HEXADIONE)

A series of four metal complexes (M = VO2+, Co2+, Cu2+, UO2+) of a Schiff base RR-trans-N,N-1,2-cyclohexane-bis (1-phenyl-5-imino-1,3-hexadione[RR-chxn (HBAA)2]) have been characterized. Their infrared studies indicate that these metals are coordinated to four carbonyl oxygen atoms of the ligand while nitrogen atoms at azomethine remain uncoordinated. The circular dichroism and electronic absorption spectra of these complexes are measured in different solvents. The CD spectra of these chelates reveal more band multiplicity than do the corresponding absorption spectra. The CD spectra arc correlated to various electronic transitions originating from the ligand and d orbitals of the metal ion.

U WAGNER ,MUHAMMAD ARIF MALIK ,NASIR AHMAD ,G SNATZKE ,ROSHAN AHMAD ,