Evidence from the ultraviolet photoelectron and X-ray photoelectron spectra of phthalimide, quinolinimide, and their N-methyl derivatives regarding the prevailing tautomeric form of quinolinimide

Abstract

The presence of an anomalous band at 12.1 eV in the u.v. photoelectron spectrum of quinolinimide when compared with those of N-methylquinolinimide, phthalimide, and N-methylphthalimide is explained as being due to a tautomeric form of quinolinimide different from that in the other compounds. This conclusion is supported by results obtained from X-ray photoelectron measurements. I.r. and ¹H n.m.r. evidence also confirms the existence of a form with strong hydrogen bonding