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  • 09월 23일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Reaction Dynamics of Photofunctional Molecules by Ultrafast X-ray Spectroscopy

2020년 9월 28일 09시 50분 44초
PHYS1-1 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
화 10시 : 40분
Physical Chemistry - Recent Methodologies in Biomolecular Spectroscopy
저자 및
Tae Kyu Kim
Department of Chemistry, Yonsei University, Korea
The geometrical structures of molecular species during chemical reactions as well as relevant electronic configurations and spin-states are crucial information on understanding various photochemical and photobiological processes. For this purpose, time-resolved X-ray spectroscopy has been developed as a complimentary tool for the ultrafast optical spectroscopies. Essentially, due to the element-specific valence-to-core level transition of probing X-rays, time-resolved X-ray spectroscopy can be sensitive spectral probes of metal-ligand interactions of solvated transition metal complexes. We have focused on these element-specific probing natures of X-ray pulses and elucidated structural dynamics in several important classes of transition metal complexes. In this presentation, I will describe our recent works on the ultrafast linkage isomerization of Ru-based photochromic complex. More specifically, we have utilized Ru L-edge and S K-edge X-ray spectroscopies to unravel details of excited state dynamics. X-ray spectra reveal the spin and valence charge of the Ru atom and provide experimental evidence that metal-centered excited states mediate isomerization. Complementary X-ray spectra of the functional ligand S atoms probe the nuclear structural rearrangements, highlighting the formation of two metal-centered states with different metal-ligand bonding. Our results address an essential open question regarding the relative roles of transient charge-transfer and metal-centered states in mediating photoisomerization.