Abstract
The complexes of nicotinamide, isonicotinamide, and picolinamide with copper(II) ion in acetonitrile and in propylene carbonate have been investigated by electrochemical, infrared, and visible spectral techniques. Picolinamide forms in these solvents a 2:1 chelated complex species in which the pyridine nitrogen and carbonyl oxygen are involved in coordination and which in solutions with picolinamide/copper(II) ratio greater than two takes on at least one additional ligand molecule. The latter picolinamide is mono-coordinated to copper(II) through the carbonyl oxygen of the amide group. In acetonitrile, nicotinamide and isonicotinamide appear to form the respective hexacoordinated complex species with the ligands monocoordinated to copper(II) ion through the pyridine nitrogen.
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