Oligothiophene-linked bisnaphthopyrans: sequential and temperature-dependent photochromism.
Photochromic bisnaphthopyrans linked with oligothiophenes were synthesized and their photochromic behavior studied. Sequential and temperature-dependent photochromism was observed in the oligothiophene linked bisnaphthopyrans. The kinetics of photo and thermal processes in bisnaphthopyrans in comparison with naphthopyrans were studied. Substituent and linking effects on the photochromic properties are discussed. We demonstrate that the cross-talk between the two photochromophores is dependent on the length of the oligothiophene linker. The presence of the bithiophene linker led to high colorability and high quantum yield of coloration.
Zhao
Weili
W
Laboratorium für Organische Chemie, ETH Zürich, HCI H335, 8093 Zürich, Switzerland.
Carreira
Erick M
EM