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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Fate of transient isomer of CH2I2: Mechanism and origin of ionic photoproducts formation unveiled by time-resolved x-ray liquidography

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Title
Fate of transient isomer of CH2I2: Mechanism and origin of ionic photoproducts formation unveiled by time-resolved x-ray liquidography
Author(s)
Sungjun Park; Jungkweon Choi; Hosung Ki; Kyung Hwan Kim; Key Young Oang; Heegwang Roh; Joonghan Kim; Shunsuke Nozawa; Tokushi Sato; Shin-ichi Adachi; Jeongho Kim; Hyotcherl Ihee
Publication Date
2019-06
Journal
JOURNAL OF CHEMICAL PHYSICS, v.150, no.22, pp.224201 -
Publisher
AMER INST PHYSICS
Abstract
© 2019 Author(s).Diiodomethane, CH2I2, in a polar solvent undergoes a unique photoinduced reaction whereby I2- and I3- are produced from its photodissociation, unlike for other iodine-containing haloalkanes. While previous studies proposed that homolysis, heterolysis, or solvolysis of iso-CH2I-I, which is a major intermediate of the photodissociation, can account for the formation of I2- and I3-, there has been no consensus on its mechanism and no clue for the reason why those negative ionic species are not observed in the photodissociation of other iodine-containing chemicals in the same polar solvent, for example, CHI3, C2H4I2, C2F4I2, I3-, and I2. Here, using time-resolved X-ray liquidography, we revisit the photodissociation mechanism of CH2I2 in methanol and determine the structures of all transient species and photoproducts involved in its photodissociation and reveal that I2- and I3- are formed via heterolysis of iso-CH2I-I in the photodissociation of CH2I2 in methanol. In addition, we demonstrate that the high polarity of iso-CH2I-I is responsible for the unique photochemistry of CH2I2
URI
https://pr.ibs.re.kr/handle/8788114/6307
ISSN
0021-9606
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
J. Chem. Phys. 150, 224201 (2019).pdfDownload

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