Studies on Hydroxamic Acids. Part VII. Infrared Spectra of Their Metal Complexes

The infrared spectra of several metal complexes of N-phenylbenzohydroxamic acid and its analogues N-phenyl-2-furohydroxamic acid and N-p-tolylbenzohydroxamic acid are presented.

The hydroxamic acids form chelates, by the replacement of hydrogen of the hydroxylamino group by metal ion and ring closure through coordination from oxygen of the carbonyl group. The bands due to O-H group in free ligand disappear, while bands due to N-O and C = O groups shift on complex forma­tion.