Spectroscopy of dimerization in organic mixed-stack compounds and tetramethyl-p-phenylene-diamine chloranil

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11 Scopus citations

Abstract

The onset of dimerization in organic mixed-stack compounds allows the appearance of the otherwise symmetric phonons in the absorption spectra. A general theoretical framework shows that the most sensitive effect arises when symmetric and antisymmetric modes have nearby frequencies; the growth of dimerization then leads to gradual transfer of absorption intensity, from the antisymmetric mode to the symmetric one. Absorption data on tetramethyl-p- phenylene-diamine chloranil show this feature and thereby demonstrate the onset of dimerization below 250 K. The transition involves a small and continuous change in ionicity.

Original languageEnglish
Pages (from-to)6056-6059
Number of pages4
JournalPhysical Review B
Volume34
Issue number8
DOIs
StatePublished - 1 Jan 1986

ASJC Scopus subject areas

  • Condensed Matter Physics

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