Photophysical properties of coplanar and twisted 1,4-bis(9-ethynylanthracenyl)benzene. Rotational equilibration in the excited states of diaryalkynes

Kelli Schmieder, Marcia Levitus, Hung Dang, Miguel A. Garcia-Garibay

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

We report the synthesis and photophysical properties of 1,4-bis(9-ethynylanthracenyl)benzene. Results in dilute hexane solutions give a very high fluorescence quantum yield (Φ = 0.97) and a lifetime of τ = 1.8 ns. Studies at different temperatures, viscosities, and micromorphologies, as well as excited-state semiempirical calculations, indicate that conformations having aryl groups coplanar absorb and emit at wavelengths that are longer than those that have their aryl groups orthogonal or twisted. A simple MO picture is consistent with essentially frictionless aryl group rotation in the ground state and a relatively high rotational barrier in cummulene-like excited states.

Original languageEnglish (US)
Pages (from-to)1551-1556
Number of pages6
JournalJournal of Physical Chemistry A
Volume106
Issue number8
DOIs
StatePublished - Feb 28 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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