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제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Photoinduced bond formation reaction dynamics of silver dicyanide (Ag(CN)2) by time-resolved X-ray liquidography (TRXL)

등록일
2018년 2월 13일 16시 49분 40초
접수번호
6133
발표코드
PHYS.P-248 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 20일 (금요일) 11:00~12:30
발표형식
포스터
발표분야
Physical Chemistry
저자 및
공동저자
Seonggon Lee, Hyotcherl Ihee*
Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
Direct observation of bond formation has been long-cherished grudge for physical chemists due to its fundamental implication in understanding chemical reactions. In this article, based on time-resolved X-ray liquidography (TRXL) technique, I analyzed photoinduced bond formation dynamics of Ag(CN)2 under water solvent. Kinetic analysis of difference X-ray scattering data revealed that, under 267-nm laser excitation, silver dicyanide complex sequentially forms singlet trimer (S1) and trimer (T1) within 169 fs and 1.38 ps, respectively. This trimer complex slowly converts into tetramer with the time constant of 335 ps, and then restores to the ground state in 177 ns. We were also able to extract four species-associated curves (SAC), which conceals structural information of each intermediate, from singular value decomposition (SVD) and related kinetic analysis. Combined structure fit of SACs regarding Debye scattering equation, solute-solvent cage contribution, and solvent heat experiment will reveal exact structural dynamics in the future.

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