Abstract
A tetramer of aniline was obtained by the chemical oxidation of aniline in sulphanilic acid. The analytical techniques of infrared, UV-visible and mass spectroscopy show formation of a relatively short conjugation length oligomer (tetraaniline). The electronic structure elucidated by X-ray photoelectron spectroscopy reveals that the tetraaniline skeleton contains both benzenoid, [-NH-C6H4-NH-], and quinoid, [-N=C6H4=N-], phenyl rings. In the oxidized state, the tetraaniline backbone containing alternate benzenoid and quinoid phenyl units structurally similar to emeraldine was not evident. Electron spin resonance and electrical conductivity data show localized charge carriers in the backbone. Experimental results predicting the molecular structure of tetraaniline are discussed.
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