Direct Observation of a Transiently Formed Isomer During lodoform Photolysis in Solution by Time-Resolved X-ray Liquidography

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.

Ki, Hosung (författare)
Kim, Joonghan (författare)
Kim, Jeongho (författare)
Park, Sungjun (författare)
Lee, Yunbeom (författare)
Kim, Kyung HwanStockholms universitet,Fysikum,Institute for Basic Science (IBS), Republic of Korea(Swepub:su)kkim (författare)
Kong, Qingyu (författare)
Moon, Jiwon (författare)
Pedersen, Martin Nors (författare)
Wulff, Michael (författare)
Ihee, Hyotcherl (författare)
Stockholms universitetFysikum (creator_code:org_t)

Ingår i:The Journal of Physical Chemistry Letters: American Chemical Society (ACS)9:3, s. 647-6531948-7185

Av författaren/redakt...: Ahn, Chi Woo; Ki, Hosung; Kim, Joonghan; Kim, Jeongho; Park, Sungjun; Lee, Yunbeom; visa fler...; Kim, Kyung Hwan; Kong, Qingyu; Moon, Jiwon; Pedersen, Martin ...; Wulff, Michael; Ihee, Hyotcherl; visa färre...

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