Crystal
Thickness Dependence of Photoinduced Crystal
Bending of 1,2-Bis(2-methyl-5-(4-(1-naphthoyloxymethyl)phenyl)-3-thienyl)perfluorocyclopentene
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Abstract
The
photoinduced crystal bending of a photochromic diarylethene
derivative, 1,2-bis(2-methyl-5-(4-(1-naphthoyloxymethyl)phenyl)-3-thienyl)perfluorocyclopentene
(<b>1a</b>), has been particularly investigated. The rodlike
crystal of <b>1a</b> shows reversible photoinduced bending upon
alternating irradiation with ultraviolet (UV) and visible light. The
photoinduced crystal bending can be repeated over 80 cycles. The rodlike
crystal of <b>1a</b> shows different bending behavior depending
on the faces irradiated with UV light. This is ascribed to the molecular
orientation viewed from the faces. Furthermore, we found that the
bending speed depends on the crystal thickness, and the curvature
change against the crystal thickness is well-fitted to Timoshenko’s
bimetal model. These findings provide a new useful strategy to design
for the photomechanical actuators