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Photochromic behavior of 5,5′-methylenebis{2-(3,5-di-tert-butylsalicylideneamino)phenol} crystal, which exhibited vapochromism, was completely controlled by contact with methanol vapor. Maintenance of a reaction room in the crystal was the key to start solid-state photoinduced isomerizaton of Schiff base.
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Taneda et al. (2007) studied this question.
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