期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 17, 页码 5674-5677出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b02862
关键词
-
资金
- CREST Program of the Japan Science and Technology Agency
- MEXT, Japan [26107010]
- Grants-in-Aid for Scientific Research [26410023, 26104533, 26107010, 15K17846] Funding Source: KAKEN
Stepwise two-photon processes not only have great potential for efficient light harvesting but also can provide valuable insights into novel photochemical sciences. Here we have designed a [2.2]paracyclophane-bridged bis(imidazole dimer), a molecule that is composed of two photochromic units and absorbs two photons in a stepwise manner. The absorption of the first photon leads to the formation of a short-lived biradical species (half-life = 88 ms at 298 K), while the absorption of the additional photon by the biradical species triggers a subsequent photochromic reaction to afford a long-lived quinoid species. The short-lived biradical species and the long-lived quinoid species display significantly different absorption spectra and rates of the thermal back-reaction. The stepwise two-photon excitation process in this photochromic system can be initiated even by incoherent continuous-wave light irradiation, indicating that this two-photon reaction is highly efficient. Our molecule based on the bridged bis(imidazole dimer) unit should be a good candidate for multiphoton-gated optical materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据