Abstract
AbstractTrans‐p‐methoxy arylazopyrazole spontaneously forms non‐centrosymmetric polar crystals, which reversibly undergo liquefaction upon photoisomerization to the cis‐isomer. This liquid cis‐isomer has a large electric dipole moment and is highly soluble in water (solubility up to ≈58 mM), which is remarkably higher than that of the trans‐isomer (690 μM). Vis‐light illumination of the aqueous cis‐isomer generates macroscopically oriented, non‐centrosymmetric crystals at the air–water interface. Polar crystals are also formed in sandwich glass cells (spacing, 20 μm) upon photo‐induced crystallization of the liquid cis‐isomer. The trans‐crystals thus formed showed second harmonic generation (SHG) whose intensity is switched on/off in response to the photo‐induced phase transition.
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