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ABSTRACT
Novel thermally irreversible photochromic compounds 1O , 2O and 3O based on 1,3-bisarylbutadiene system were synthesized. The closed ring-forms 1C and 2C showed absorption maximum at 445 nm, while the closed ring-form 3C , a methyl group of 2C on C-5 of thienyl ring was replaced with a formyl group, showed the absorption maximum at 500 nm.
Notes
1Ratio of O-form and C-form at photostationary state of 313-nm light irradiation.
2505-nm light irradiation.