Ludovic Jean, Aurélie Gernet, Louise-Marie Balivet, Ahmed El Rhaz, Lucas Pagès, Guillaume Laurent, François Maurel
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Abstract
This study reports a series of novel heterocyclic hemiindigos (Het-HI) synthesised via the condensation of indoxyl acetate with various heteroaromatic aldehydes. The influence of electron-rich and electron-poor heterocycles on the photochemical and photophysical properties of these compounds have been investigated. Our findings reveal that several Het-HIs exhibit noteworthy photoswitching behaviour, including enhanced absorption at the visible region. Notably, certain derivatives respond efficiently to green and red light, achieving good conversions to the metastable E-isomer and displaying prolonged half-lives of up to 53 days in a polar solvent. The results highlight the potential of these photoswitches for applications in molecular devices and responsive materials.
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