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The photomechanical motion of chiral crystals of trans‐azobenzene derivatives with an (S)‐ and (R)‐phenylethylamide group was investigated and compared with a racemic crystal. Changes in the UV/Vis absorption spectra of the powdered crystals before and after UV irradiation were measured by using an optical waveguide spectrometer, showing that the lifetime of the cis‐to‐trans thermal back‐isomerization...