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JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 128, Issue 3, Pages 935-939Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja056324a
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Electron transfer at the molecule-metal interface of self-assembled monolayers of 1,1';4',1-terphenyl-4-thiol (BBB) and its partially fluorinated counterpart (BFF: p-thiophenyl-nonafluorobiphenyl) on Au(111) is investigated by core-hole clock spectroscopy. Ultrafast electron transfer at the BBB/Au(111) interface in the low-femtosecond regime (on the same time scale as the C 1s core-hole lifetime, similar to 6 fs) was observed. In contrast, for BFF/Au(111), the interface electron transfer was forbidden during the core-hole decay. This strongly suggests that fluorination of phenyl rings significantly enhances the localization of the excited electrons in the LUMO.
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