|
Type |
Poster Presentation |
Area |
물리화학 |
Room No. |
포스터발표장 |
Time |
4월 20일 (목요일) 11:00~12:30 |
Code |
PHYS.P-21 |
Subject |
Time-Resolved X-ray Absorption Spectroscopy of Charge Transfer Dynamics of Solvated Ru polypyridyl complex |
Authors |
마로리, 김태규* 부산대학교 화학과, Korea |
Abstract |
Time-Resolved X-ray Absorption Spectroscopy (TR-XAS) is a special tool to investigate molecular dynamics. It also has become possible to observe the transient chemical reactions on fundamental timescale. Ru-based polypyridyl complexes are used in various fields as solar energy conversion, artificial photosynthetic systems and optical sensing. We directly observed the transient 3dd state of ruthenium-based dye molecule, which is [Ru(m-bpy)3]]2+ (m-bpy = 6-methyl- 2,2′-bipyridine) in liquid phase, by means of ultrafast transient XANES spectroscopy at Ru L3- and K-edge regions at ALS beamline. Besides we performed the time-dependent density functional theory calculations of Ru 2p core-level excitations to visualize the movement of charge density around the Ru atom and the surrounding ligands. To determine the structural parameter changes in Ru-N bond of [Ru(m-bpy)3]2+ during the 3dd process, we have performed the analysis of transient EXAFS spectra at K-edge region of Ru at KEK beamlime. We find that not only the stabilization of Ru 2p core and 4d valence orbitals, respectively, from L3-edge XANES spectroscopy but also the difference of bond distance of Ru–N and Ru–Nmethyl bonds by 0.01 and 0.03 Å, respectively, from K-edge EXAFS spectroscopy. |
E-mail |
rory6847@gmail.com |
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