期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 9, 页码 4874-4883出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp5122036
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资金
- Deutsche Forschungsgemeinschaft [Sonderforschungsbereich 658, FR2726/4]
- FU Berlin by FPU [AP-2007-001157]
Diarylethene derivatives are photochromic molecular switches, undergoing a ring-opening/-closing reaction by illumination with light. The symmetry of the closed form is determined by the WoodWard Hoffinann rules according to which the reaction proceeds by corirotatory rotation -in that case. Here, we show by a cOrnbined approach of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations that the Open isomer of 4,4'-(4,4'-(perfluorocydopent-1-ene-1,2-diyl)bis(5-methyl-thiophent-4,2,4-dipyridine) (PDTE) retains its open form upon adsorption on a Ag(111) surface. It caribe switched into a closed form, which we identify as the digrotatOly cydization product, by controlled manipulation 'With the STM tip, Evidence of an electric-field dependent switching-process 'is interpreted on the basis of a Simple electroStatic Model, which suggests that the reaction proceedS via an upright intermediate state. This pathway thus strongly differs from the switching reaction in solution.
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