Direct observation of bond formation in solution with femtosecond X-ray scattering
SCIE
SCOPUS
- Title
- Direct observation of bond formation in solution with femtosecond X-ray scattering
- Authors
- Kim, KH; Kim, JG; Nozawa, S; Sato, T; Oang, KY; Kim, T; Ki, H; Jo, J; Park, S; Song, C; Sato, T; Ogawa, K; Togashi, T; Tono, K; Yabashi, M; Ishikawa, T; Kim, J; Ryoo, R; Kim, J; Ihee, H; Adachi, S
- Date Issued
- 2015-02
- Publisher
- NPG
- Abstract
- The making and breaking of atomic bonds are essential processes in chemical reactions. Although the ultrafast dynamics of bond breaking have been studied intensively using time-resolved techniques(1-3),, it is very difficult to study the structural dynamics of bond making, mainly because of its bimolecular nature. It is especially difficult to initiate and follow diffusion-limited bond formation in solution with ultrahigh time resolution. Here we use femtosecond time-resolved X-ray solution scattering to visualize the formation of a gold trimer complex, [Au(CN)(2)(-)](3) in real time without the limitation imposed by slow diffusion. This photoexcited gold trimer, which has weakly bound gold atoms in the ground state(4-6), undergoes a sequence of structural changes, and our experiments probe the dynamics of individual reaction steps, including covalent bond formation, the bent-to-linear transition, bond contraction and tetramer formation with a time resolution of 500 femtoseconds. We also determined the three-dimensional structures of reaction intermediates with sub-angstrom spatial resolution. This work demonstrates that it is possible to track in detail and in real time the structural changes that occur during a chemical reaction in solution using X-ray free-electron lasers' and advanced analysis of time-resolved solution scattering data.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26704
- DOI
- 10.1038/NATURE14163
- ISSN
- 0028-0836
- Article Type
- Article
- Citation
- NATURE, vol. 518, no. 7539, page. 385 - 389, 2015-02
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