Raman spectroscopy shows interchain through space charge delocalization in a mixed valence oligothiophene cation and in its π-dimeric biradicaloid dication

Juan Casado, Kazuo Takimiya, Tetsuo Otsubo, Francisco J. Ramírez, J. Joaquín Quírante, Rocío Ponce Ortiz, Sandra R. González, María Moreno Oliva, Juan T. López Navarrete

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The vibrational Raman spectra of a decathiophene are provided in three relevant oxidations states: for the radical cation, its class III mixed valence system and its "frozen, -170 °C" class II MV analogue; for the dication, its singlet biradical π-dimer and its "hot, +70 °C" magnetically active triplet excited state. Everything is compatible with interpentathiophene charge delocalization occurring at distances of ∼4-5 Å similar to those found in the crystals of π-stacked oligothiophenes. This stresses the interest of this spectroscopic tool for the analyses of electronic processes in crystals or in thin films of conjugated organic molecules.

Original languageEnglish
Pages (from-to)14028-14029
Number of pages2
JournalJournal of the American Chemical Society
Volume130
Issue number43
DOIs
Publication statusPublished - 2008 Oct 29
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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