Photochemical reaction of p-hydroxycinnamic-thiophenyl ester in the microcrystalline state

Anwar Usman*, Tsuyoshi Asahi, Teruki Sugiyama, Hiroshi Masuhara, Norimitsu Tohnai, Mikiji Miyata

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We have studied the photochromic reaction of p-hydroxycinnamic-thiophenyl ester in the microcrystalline state. We attributed the fluorescence spectral evolution of the mierocrystal, under UV irradiation, to the photoinduced trans-to-cis isomerization, The photocyclic behavior of the chromophore was demonstrated by cis-to-trans back reaction under a subsequent visible light irradiation. In addition, the [2 + 2] topochemical photocyclodimer was observed as another photoproduct. It is considered that the cooperative photoisomerization is initiated at the local lattice distortion and free spaces around the [2 + 2] cyclodimer near the crystal surface, and the photoisomerization induces larger lattice deformation and further photoisomerization in the interior of the crystal.

Original languageEnglish
Pages (from-to)14233-14240
Number of pages8
JournalJournal of Physical Chemistry B
Volume114
Issue number45
DOIs
StatePublished - 8 Dec 2010

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