Ultrafast photo-dynamics of a reversible photochromic spiropyran

Jonathan Hobley, Ursula Pfeifer-Fukumura, Michael Bletz, Tsuyoshi Asahi, Hiroshi Masuhara, Hiroshi Fukumura

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71 Citations (Scopus)


We report the first ultrafast ring closure kinetics of the merocyanine (MC) of a reverse photochromic spiropyran 1′,3′,3′-trimethyl-6,8-dinitrospiro[2H-1-benzopyran-2,2-indoli ne] (6,8-dinitro BIPS) and its 1′-(2-carboxyethyl) substituted derivative. The reaction is fast and essentially over in a few hundred picoseconds. The rate of MC-S1 state decay evaluated from transient absorbance can be correlated directly with the MC-S1 state lifetime as determined using stimulated and ordinary emission measurements. The recovery of the MC-S0 state from MC-S1 has a component with a lifetime of 60-78 ps in acetonitrile with a second component of 350-470 ps probably due to a metastable intermediate. We can further establish that the excited MC-S1 state takes on the order of 500 fs to form from higher-energy states after photoexcitation with 390 nm light.

Original languageEnglish
Pages (from-to)2265-2270
Number of pages6
JournalJournal of Physical Chemistry A
Issue number10
Publication statusPublished - 2002 Mar 14

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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