Femtosecond dynamics of the photochromic reaction of a thiophene
oligomer with a diarylethene structure
in solution was analyzed by transient absorption spectroscopy. It
was found that the intermediate species
with an absorption maximum at ∼515 nm was formed within 100 fs and
that the closed-ring form of the
thiophene oligomer was formed mainly from the intermediate with a time
constant of ∼1.1 ps.
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