期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 1, 期 7, 页码 1112-1115出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz100228w
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- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [471]
We demonstrate that photochromism based on light-driven reversible C-N single bond cleavage can enable rapid coloration upon UV light irradiation and successive fast thermal back-reaction within tens of microseconds at room temperature. According to Marcus theory, the thermal back-reaction would be accelerated with increasing Delta G(0), which is closely linked to the decrease in Delta G dagger. We have considered that the Delta G(0) of the thermal back-reaction could be enlarged by destabilizing the colored species and designed pseudogem-DPI-PI[2.2]PC, with a [2.2]paracyclophane moiety that couples diphenylimidazole and phenanthroimidazole groups. The present study demonstrates that controlling the stability of the biradical state is effective in accelerating the thermal back-reaction for the photochromic [2.2]paracyclophane-bridged imidazole dimer.
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