Band gap of carbon-sulfur [n]helicenes

Makoto Miyasaka, Maren Pink, Arnon Olankitwanit, Suchada Rajca, Andrzej Rajca

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Asymmetric synthesis of (-)-[9]helicene, as well as preparation of its lower homologues, completes the series of carbon-sulfur [5]-, [7]-, [9]-, and [11]helicenes. Spectroscopic and electrochemical studies of this series provide an absorption onset-based band gap, E g = 3.40 eV, for a cross-conjugated (C 2S) n helix; this value may be compared to E g = 3.59 eV obtained from TD-DFT computed excitation energies for a series of dimethyl-substituted [n]helicenes (n ≥ 31).

Original languageEnglish (US)
Pages (from-to)3076-3079
Number of pages4
JournalOrganic Letters
Issue number12
StatePublished - Jun 15 2012
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry


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