121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-216
Subject Excited state intramolecular proton transfer of curcumin and the solvation dynamics studied by time-resolved Raman spectroscopy
Authors Myungsam Jen, Sebok Lee, JOONWOO KIM, kooknam jeon, YOONSOO PANG*
Department of Chemistry, Gwangju Institute of Science and Technology, Korea
Abstract Curcumin has been of great interest in chemistry and related disciplines for the applications to antioxidant, anti-inflammatory, protein aggregation prevention, etc. Several time-resolved spectroscopic studies were performed on the chemical reaction of curcumin in aqueous environments. Recently, the excited state intramolecular proton transfer (ESIPT) and solvation dynamics of curcumin in polar protic and aprotic solvents were also studied by fluorescence upconversion spectroscopy, where the solvent polarity dependent reactions occurring in ~100 ps were reported. In protic solvents, the intermolecular hydrogen bonds formed within the center chelate ring of curcumin may facilitate the nonradiative deactivation process to result reduced quantum yields. The detailed structural changes of curcumin during the ESIPT process in various solvent environments have not been investigated in detail, thus in this study the excited state dynamics of curcumin and the subsequent solvation dynamics of several organic solvents were explored by femtosecond stimulated Raman spectroscopy which can provide structural information of probe molecules with high temporal (<50 fs) and spectral resolution (<10 cm-1). The ultrafast ESIPT process which was not resolved in previous time-resolved studies was explained by the time-resolved Raman spectroscopy.
E-mail watqdt@gist.ac.kr