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Title: Photoinduced Trans-to-cis Phase Transition of Polycrystalline Azobenzene at Low Irradiance Occurs in the Solid State

Journal Article · · ChemPhysChem

Abstract The ability to produce large‐scale, reversible structural changes in a variety of materials by photoexcitation of a wide variety of azobenzene derivatives has been recognized for almost two decades. Because photoexcitation of trans ‐azobenzene produces the cis ‐isomer in solution, it has generally been inferred that the macroscopic structural changes occurring in materials are also initiated by a similar large‐amplitude trans ‐to‐ cis isomerization. This work provides the first demonstration that a trans ‐to‐ cis photoisomerization occurs in polycrystalline azobenzene, and is consistent with the previously hypothesized nature of the trigger in the photoactuated mechanisms of the materials in question. It is also demonstrated that under low irradiance, trans ‐to‐ cis isomerization occurs in the solid (not via a pre‐melted phase); and the presence of the cis ‐isomer thus lowers the melting point of the sample, providing a liquid phase. A variety of experimental techniques were employed, including X‐ray diffraction measurements of polycrystalline azobenzene during exposure to laser irradiation and fluorescence measurements of the solid sample. A practical consequence of this work is that it establishes trans ‐azobenzene as an easily obtainable and well‐defined control for monitoring photoinduced structural changes in X‐ray diffraction experiments, using easily accessible laser wavelengths.

Research Organization:
Ames Lab. and Iowa State Univ., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1399483
Alternate ID(s):
OSTI ID: 1374764
Report Number(s):
IS-J-9462
Journal Information:
ChemPhysChem, Vol. 18, Issue 18; ISSN 1439-4235
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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