Photochromic reactions of three diarylethene derivatives embedded in three types of polymer matrices were studied using a variety of spectroscopic techniques and quantum ab initio computations. It was found that the photochromic efficiencies of diarylethene molecules depend on the structural and electronic characteristics of Franck-Condon region in the excited states, and also depend strongly on the sizes of free inner spaces of the matrices. The steady-state and time-resolved fluorescence studies revealed the detailed kinetics of the planar and twisted conformers in the excited states. The observed fluorescence lifetimes of the planar and twisted conformers were ~2.6 ns and 8~30 ns.
Bibliographical noteFunding Information:
This work was financially supported by Advanced Photonics Technology Project and CRM-KOSEF grant (1998G0102), Republic of Korea. We thank Sung Kwang Lee for assisting ab initio computation.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry