Unusually short excited state lifetimes of indenofluorene and fluorenofluorene derivatives result from a conical intersection

Bradley D. Rose, Leah E. Shoer, Michael R. Wasielewski, Michael M. Haley

Research output: Contribution to journalArticle

25 Citations (Scopus)


The ultrafast excited state decay rates for indenofluorene and fluorenofluorene derivatives as measured by transient absorption spectroscopy are reported. The excited state lifetimes of the molecules were extremely short (ca. 9-12 ps) and are a result of the p-xylylene motif in indenofluorenes and the corresponding expanded 2,6-naphthoquinonedimethide in fluorenofluorene. Quantum chemical calculations indicate that the fast relaxation to the ground state results from a potential energy surface crossing between the S0 and S1 states. This process in turn provides an efficient route for excited state deactivation and explains why this class of quinoidal molecules is non-emissive.

Original languageEnglish
Pages (from-to)137-141
Number of pages5
JournalChemical Physics Letters
Publication statusPublished - Nov 25 2014


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this