O2, NO2 and NH3 coordination to Co-porphyrin studied with scanning tunneling microscopy on Au(111)
| Autor: | Yeunhee Lee, Min Hui Chang, Na Young Kim, Yun Hee Chang, Howon Kim, Un Seung Jeon, Se-Jong Kahng, Yong-Hyun Kim |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Resonance (chemistry) Ring (chemistry) 01 natural sciences Porphyrin 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical physics law Microscopy General Materials Science Density functional theory Physics::Chemical Physics Scanning tunneling microscope 0210 nano-technology Spectroscopy Quantum tunnelling |
| Zdroj: | Nanoscale. 11:8510-8517 |
| ISSN: | 2040-3372 2040-3364 |
| Popis: | 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 (O2, NO2, and NH3, respectively) coordinated to Co-porphyrin on Au(111). A square ring structure was observed for O2, 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. |
| Databáze: | OpenAIRE |
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