info:eu-repo/semantics/article
Photoinduced changes of absorption and circular dichroism in a chiral nematic phase containing a photochromic fulgide
Fecha
2006-04Registro en:
Bossi, Mariano Luis; Rodriguez, Juan Bautista; Aramendia, Pedro Francisco; Photoinduced changes of absorption and circular dichroism in a chiral nematic phase containing a photochromic fulgide; Elsevier Science Sa; Journal of Photochemistry and Photobiology A: Chemistry; 179; 1-2; 4-2006; 35-41
1010-6030
CONICET Digital
CONICET
Autor
Bossi, Mariano Luis
Rodriguez, Juan Bautista
Aramendia, Pedro Francisco
Resumen
Mesophases composed of a nematic mixture (ZLI1132) alone or with a chiral inductor (twisted nematic phase) were doped with a photochromic furylfulgide (FFU) and irradiated with visible and UV light. FFU shows great fatigue resistance and high repeatability of photochromic cycles in these media. Quantum yields for the photoconversions are very similar to values previously reported in solution. Beside from the photochromic changes in absorption spectra, a great and reversible circular dichroism change in the chiral nematic phase was observed in the visible absorption band of the cyclic isomeric form of FFU upon UV irradiation. This change is due to the mesophase-induced chiral absorption. The potential of this signal for information storage is discussed.