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FBS Colloquia No.260Photophysics Laboratory

Seminar or Lecture

Study on intermolecular dynamics using time-resolved attenuated total reflection terahertz spectroscopy

Nguyen Ngoc Phuong [Researcher(FBS Photophysics Laboratory(Kimura Lab.) / Department of Nanomaterials Science and Energy Conversion Institute of Applied Materials Science Vietnam Academy of Science and Technology]

Date and Time 24 Dec (Thu), 2020
Place Online (Zoom) | An email will be sent with the meeting URL, ID, and password on the morning of each colloquium.
Language English
Contact

Name:Junji Watanabe      
Tel :06-6879-4602
E-mail:junw[at]fbs.osaka-u.ac.jp

Study on intermolecular dynamics using time-resolved attenuated total reflection terahertz spectroscopy

To reveal highly efficient photocatalytic properties of an artificial photosynthesis material [Re(CO)2(bpy){P(OEt)3}2](PF6), we have directly observed the photo-induced relaxation dynamics and reductive quenching process of the photo-excited state on a photosynthesis material in Triethanolamine (TEOA) solvent as an electron donor by time-resolved attenuated total reflection spectroscopy in the terahertz (THz) region. The spectrum of the complex in TEOA has an intermolecular vibrational mode between the complex and TEOA molecules, which reflects the precursor of the reductive quenching process. The intermolecular vibrational mode has three-step relaxation process in a picosecond timescale after photo-excitation, where firstly the triplet metal-to-ligand charge-transfer excited state is vibrationally cooled down, secondly the distance between Re and TEOA is reduced by the rotation of TEOA molecules due to dipole-dipole interaction accelerated by heat transfer, and finally electrons transfer from TEOA to Re. These observations provide us the detailed information of the electron transfer process of photocatalytic properties of [Re(CO)2(bpy){P(OEt)3}2](PF6) in TEOA solvent.

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