Strong Two‐Photon Absorption of Singlet Diradical Hydrocarbons

Abstract

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. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z605061_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.