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The infrared absorption spectra of six 2-oxo-1,3-bis(phenylhydrazones), four tris(phenylhydrazones), and six related mono- and bis-(phenylhydrazono) derivatives are presented. For comparison, partial spectra of ten selected aromatic azo compounds are also given and discussed. The important features of the absorption bands arising from the N = N (1579 to 1558 cm -1 and 1447 to 1408 cm -1 ), N-H (bending) (1557 to 1515 cm -1 ), and Ph-N (1163 to 1123 cm -1 ) groups are presented and discussed.

Infrared absorption spectra of 2-oxo-1,3-bis-(phenylhydrazono) derivatives and related bis- and tris-phenylhydrazones