Direct Observation of a Transiently Formed Isomer During Iodoform Photolysis in Solution by Time-Resolved X-ray Liquidography
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- Title
- Direct Observation of a Transiently Formed Isomer During Iodoform Photolysis in Solution by Time-Resolved X-ray Liquidography
- Authors
- Chi Woo Ahn; Hosung Ki; Joonghan Kim; Jeongho Kim; Sungjun Park; Yunbeom Lee; KIM, KYUNG HWAN; Qingyu Kong; Jiwon Moon; Martin Nors Pedersen; Michael Wulff; Hyotcherl Ihee
- Date Issued
- 2018-02-01
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Photolysis of iodoform (CHI3) in solution has been extensively studied, but its reaction mechanism remains elusive. In particular, iso-iodoform (iso-CHI2-I) is formed as a product of the photolysis reaction, but its detailed structure is not known, and whether it is a major intermediate species has been controversial. Here, by using time-resolved X-ray liquidography, we determined the reaction mechanism of CHI3 photodissociation in cyclohexane as well as the structure of iso-CHI2-I. Both iso-CHI2-I and CHI2 radical were found to be formed within 100 ps with a branching ratio of 40:60. Iodine radicals (I), formed during the course of CHI3 photolysis, recombine nongeminately with either CHI2 or I. Based on our structural analysis, the I-I distance and the C-I-I angle of iso-CHI2-I were determined to be 2.922 +/- 0.004 angstrom and 133.9 +/- 0.8 degrees, respectively.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/94126
- DOI
- 10.1021/acs.jpclett.7b03125
- ISSN
- 1948-7185
- Article Type
- Article
- Citation
- Journal of Physical Chemistry Letters, vol. 9, no. 9, page. 647 - 653, 2018-02-01
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