trans-4-Phenylazobenzoic acid (pab) crystallized in three different morphologies: long rod-like crystals, bendable long thin crystals, and bent crystals. Of them, the bent crystals were obtained by recrystallizing after subjecting pab to UV-irradiation in solution. A small amount of cis-form in the bent crystals is responsible for the bent nature, while the elastic bending of thin platy crystals can be understood from the crystal packing.
K. Yadava, X. Qin, X. Liu and J. J. Vittal, Chem. Commun., 2019, 55, 14749 DOI: 10.1039/C9CC07774J
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