O-2, NO2 and NH3 coordination to Co-porphyrin studied with scanning tunneling microscopy on Au(111)

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The coordination structure between small molecules and metalloporphyrins plays a crucial role in functional reactions such as bio-oxidation and catalytic activation. Their vertical, tilting, and dynamic structures have been actively studied with diffraction and resonance spectroscopy for the past four decades. Contrastingly, real-space visualization beyond simple protrusion and depression is relatively rare. In this paper, high-resolution scanning tunnelling microscopy (STM) images are presented of di-, tri-, and tetra-atomic small molecules (O-2, NO2, and NH3, respectively) coordinated to Co-porphyrin on Au(111). A square ring structure was observed for O-2, a rectangular ring structure for NO2, and a bright-center structure for NH3 at 80 K. The symmetries of experimental STM images were reproduced in density functional theory (DFT) calculations, considering the precession motion of the small molecules. Thus, this study shows that the structure of small molecules coordinated to metalloporphyrins can be visualized using high-resolution STM and DFT calculations.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2019-05
Language
English
Article Type
Article
Citation

NANOSCALE, v.11, no.17, pp.8510 - 8517

ISSN
2040-3364
DOI
10.1039/c9nr00843h
URI
http://hdl.handle.net/10203/262091
Appears in Collection
NT-Journal Papers(저널논문)
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