ja5b07806_si_011.avi (3.51 MB)
Surface and Bulk Effects in Photochemical Reactions and Photomechanical Effects in Dynamic Molecular Crystals
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posted on 2015-11-04, 00:00 authored by Naba K. Nath, Tomče Runčevski, Chia-Yun Lai, Matteo Chiesa, Robert E. Dinnebier, Panče NaumovThe
increasing number of reports on photomechanical effects in
molecular crystals necessitates systematic studies to understand the
intrinsic and external effectors that determine and have predictive
power of their type and magnitude. Differential light absorption and
product gradient between the surface and the bulk of the crystal are
often invoked to qualitatively explain the mechanical response of
crystals to light; however, the details on how this difference in
photochemical response accounts for macroscopic effects such as surface
modification, deformation, or disintegration of crystals are yet to
be established. Using both bulk- and surface-sensitive analytical
techniques, a rare instance of benzylidenefuranone crystals is studied
here, and it is capable of several distinct types of photomechanical
response including surface striation and delamination, photosalient
effect (ballistic disintegration and motion), and photoinduced bending
by dimerization. The results provide a holistic view on these effects
and set the stage for the development of overarching theoretical models
to describe the photomechanics in the ordered solid state.
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Keywords
photomechanical responsePhotomechanical Effectsproduct gradientphotosalient effectresponse accountsBulk EffectsDifferential light absorptiontypePhotochemical Reactionsphotomechanical effectssurface striationbulkDynamic Molecular CrystalsThebenzylidenefuranone crystalssurface modificationmacroscopic effectsdisintegration
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