TY - JOUR
T1 - Ultrafast photo-dynamics of a reversible photochromic spiropyran
AU - Hobley, Jonathan
AU - Pfeifer-Fukumura, Ursula
AU - Bletz, Michael
AU - Asahi, Tsuyoshi
AU - Masuhara, Hiroshi
AU - Fukumura, Hiroshi
PY - 2002/3/14
Y1 - 2002/3/14
N2 - 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.
AB - 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.
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U2 - 10.1021/jp012564a
DO - 10.1021/jp012564a
M3 - Article
AN - SCOPUS:0037076126
VL - 106
SP - 2265
EP - 2270
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
SN - 1089-5639
IS - 10
ER -