Investigating structure dynamics of small molecular systems using time-resolved x-ray solution scattering = 시간분해 액상 엑스선 회절법을 이용한 작은 분자 시스템의 구조 및 동역학 연구

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This thesis deals with the structural dynamics of photolysis of iodoform (CHI3) using time-resolved x-ray solution scattering. Iodoform has been attracted much of attention as it is used as a precursor to an iodopropantion reaction in which photodecomposition under ultraviolet light reacts with an olefin functional group to form a stereoselective cyclic product. In particular, studies have been reported that the stereoselectivity of cyclic compounds produced during the iodopropanation reaction may be due to the unique structure of iso-iodoform, which is one of the photolysis intermediates of iodoform. However in previous studies, the structure of iso-iodoform was solely dependent on theoretical calculations, and the structure of iso-iodoform was not revealed directly. In this thesis, x-rays were used to identify the three-dimensional structure of all intermediates produced during photolysis of iodoform including iso-iodoform, and to propose a new reaction mechanism by capturing the CHI2 radical, which is hard to detect by spectroscopy. Furthermore, by using the x-ray pulses provided by the x-ray free electron laser (XFEL), a time-resolved x-ray solution scattering method based on improved temporal resolution (~ 200 fs) could be attempted, and through this, the process of iso-iodoform formation can also be identified.
Advisors
Ihee, Hyotcherlresearcher이효철researcher
Description
한국과학기술원 :화학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2020.8,[iv, 79 p. :]

Keywords

Time-resolved x-ray solution scattering▼astructural dynamics▼aintermediate▼aisomer▼aphotoreaction; 시간분해 엑스선 액상 산란▼a구조동역학▼a중간체▼a이성질체▼a광반응

URI
http://hdl.handle.net/10203/284384
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=924429&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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