Photoreaction of Matrix-Isolated Dihydroazulene-Functionalized Molecules on Au{111}
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- 作者：Bala Krishna Pathem ; Yue Bing Zheng ; Seth Morton ; Michael 脜xman Petersen ; Yuxi Zhao ; Choong-Heui Chung ; Yang Yang ; Lasse Jensen ; Mogens Br酶ndsted Nielsen ; Paul S. Weiss
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：February 13, 2013
- 年：2013
- 卷：13
- 期：2
- 页码：337-343
- 全文大小：428K
- 年卷期：v.13,no.2(February 13, 2013)
- ISSN：1530-6992
文摘
Dihydroazulenes are photochromic molecules that reversibly switch between two distinct geometric and conductivity states. Molecular design, surface attachment, and precise control over the assembly of such molecular machines are critical in order to understand molecular function and motion at the nanoscale. Here, we use surface-enhanced Raman spectroscopy on special atomically flat, plasmonically enhanced substrates to measure the photoreaction kinetics of isolated dihydroazulene-functionalized molecules assembled on Au{111}, which undergo a ring-opening reaction upon illumination with UV light and switch back to the initial isomer via thermal relaxation. Photokinetic analyses reveal the high efficiency of the dihydroazulene photoreaction on solid substrates compared to other photoswitches. An order of magnitude decrease in the photoreaction cross section of surface-bound dihydroazulenes was observed when compared with the cross sections of these molecules in solution.