Photokinetic behaviour of bi-photochromic supramolecular systems: Part 3. Compounds with chromene and spirooxazine units linked through ethane, ester and acetylene bridges
作者： G. Favaro , D. Levi , F. Ortica , A. Samat , R. Guglielmetti
DOI: 10.1016/S1010-6030(01)00638-4
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摘要: Abstract The photochemistry of four bi-photochromic (BiPh) compounds was investigated in toluene solution under steady state irradiation over a 20 °C temperature range. Three these supermolecules are built up by two chromene moieties linked rigid acetylenic bridge ( 1 ) or flexible spacers, ethane 3 and ester 4 ); the other contains spirooxazine an 2 ). Very efficient photo-colouration occurred upon UV at room temperature. Two systems behaved as classical thermoreversible photochromic systems, while exhibited thermal photochemical reversibility. This behaviour attributed to formation (for three photoproducts with different stability. By analytical graphical treatments kinetic equations describing dynamic photochromes, spectral, (quantum yields) (rate constants activation energies) parameters were determined.
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