Issue 38, 2016

Photoinduced topographical changes on microcrystalline surfaces of diarylethenes

Abstract

By alternate irradiation with UV and visible light, reversible topographical changes were observed on the microcrystalline surfaces of diarylethene derivatives above the glass transition temperatures (Tg) of their open-ring isomers. For the photogenerated closed-ring isomers, the crystal growth proceeded at the surface softened by molecular movement. This is the self-aggregation of the closed-ring isomers. The photogenerated surface topographies appear depending on the crystal habits of the closed-ring isomers. Reflecting the properties (crystal habits) of diarylethene derivatives, we obtained cubic, needle, and plate-shaped crystals of the closed-ring isomers on the microcrystalline surfaces of the open-ring isomers by irradiation with UV light. Even a derivative having one isopropyl group at a reactive carbon atom, whose closed-ring isomer is thermally unstable, showed photoinduced topographical changes, because the Tg of the open-ring isomer is around ambient temperature.

Graphical abstract: Photoinduced topographical changes on microcrystalline surfaces of diarylethenes

Supplementary files

Article information

Article type
Paper
Submitted
31 מרץ 2016
Accepted
10 יונ 2016
First published
13 יונ 2016

CrystEngComm, 2016,18, 7229-7235

Photoinduced topographical changes on microcrystalline surfaces of diarylethenes

N. Fujinaga, N. Nishikawa, R. Nishimura, K. Hyodo, S. Yamazoe, Y. Kojima, K. Yamamoto, T. Tsujioka, M. Morimoto, S. Yokojima, S. Nakamura and K. Uchida, CrystEngComm, 2016, 18, 7229 DOI: 10.1039/C6CE00718J

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