期刊
NATURE CHEMISTRY
卷 5, 期 7, 页码 621-627出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.1667
关键词
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资金
- NanoNed (the Dutch nanotechnology initiative of the Ministry of Economic Affairs)
- Foundation for Fundamental Research on Matter (FOM programme Atomic and Molecular Nanophysics)
- Ministry of Education, Culture and Science [024.001.035]
- Fund of Scientific Research-Flanders (FWO)
- KU Leuven (GOA)
- Belgian Federal Science Policy Office [IAP-P7/05]
- Council for the Chemical Sciences of The Netherlands Organisation for Scientific Research (CW-NWO) [700.58.423, 700.57.023]
- European Research Council for an ERC Starting Grant [NANOCAT - 259064]
- [CTQ2010-16339]
- [2009 SGR 158]
Manganese porphyrins have been extensively investigated as model systems for the natural enzyme cytochrome P450 and as synthetic oxidation catalysts. Here, we report single-molecule studies of the multistep reaction of manganese porphyrins with molecular oxygen at a solid/liquid interface, using a scanning tunnelling microscope (STM) under environmental control. The high lateral resolution of the STM, in combination with its sensitivity to subtle differences in the electronic properties of molecules, allowed the detection of at least four distinct reaction species. Real-space and realt-ime imaging of reaction dynamics enabled the observation of active sites, immobile on the experimental timescale. Conversions between the different species could be tuned by the composition of the atmosphere (argon, air or oxygen) and the surface bias voltage. By means of extensive comparison of the results to those obtained by analogous solution-based chemistry, we assigned the observed species to the starting compound, reaction intermediates and products.
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