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학술발표회초록보기

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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Identifying a intermediate photoproduct of CHI3 by combining time-resolved X-ray absorption spectroscopy and X-ray solution scattering

등록일
2012년 2월 22일 20시 08분 18초
접수번호
1371
발표코드
PHYS.P-508 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 25일 (수요일) 18:00~21:00
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
김경환, 이효철
KAIST 화학과, Korea
Identifying intermediate species along a reaction pathway is a first step towards a complete understanding of the reaction mechanism, but this is often non trivial. There has been an on-going debate on which of the two intermediates, the CHI2 radical or the CHI2-I isomer, is the dominant photoproduct. In this communication, by combining time-resolved X-ray scattering (TRXS) and time-resolved X-ray absorption spectroscopy (TR-XAS), we present strong evidence that the CHI2 radical is formed rather than CHI2-I isomer after photolysis at 267 nm in methanol. . The two methods are complementary and capable of monitoring global reaction pathways from their structural sensitivity. The TRXS measurements, conducted using the laser-time-slicing, show no signature of isomer formation. The TR-XAS measurements performed at the iodine L1 and L3 edges are consistent with the conclusion of TRXS. The results exemplify that by combining both methods, give more convincing results and provide a better understanding of the reaction.

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