Strong two-photon absorption of singlet diradical hydrocarbons

Kenji Kamada, Koji Ohta, Takashi Kubo, Akihiro Shimizu, Yasushi Morita, Kazuhiro Nakasuji, Ryohei Kishi, Suguru Ohta, Shin Ichi Furukawa, Hideaki Takahashi, Masayoshi Nakano

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262 Citations (Scopus)


(Chemical Equation Presented) Ones and twos: The two-photon absorption cross sections (σ(2)) of singlet diradical hydrocarbons with phenalenyl peripheral groups (see scheme) are larger than those of closed-shell aromatic hydrocarbons by an order of magnitude or more and are comparable to those of π-conjugated compounds with strong electron donor or acceptor substituents. A significant increase in cross section was also observed in the resonance-enhanced region.

Original languageEnglish
Pages (from-to)3544-3546
Number of pages3
JournalAngewandte Chemie - International Edition
Issue number19
Publication statusPublished - 2007


  • Absorption
  • Conjugation
  • Fused-ring systems
  • Optical properties
  • Radicals


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