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 language | English (US) |
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Pages (from-to) | 1551-1556 |
Number of pages | 6 |
Journal | Journal of Physical Chemistry A |
Volume | 106 |
Issue number | 8 |
DOIs | |
State | Published - Feb 28 2002 |
Externally published | Yes |
ASJC Scopus subject areas
- Physical and Theoretical Chemistry