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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Dynamics of Solute-Solvent Interaction in Reverse Micelles

등록일
2012년 2월 28일 17시 41분 30초
접수번호
1512
발표코드
PHYS.P-518 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 25일 (수요일) 18:00~21:00
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
이주용, 조민행
고려대학교 화학과, Korea
IR probes have been extensively used to monitor local electrostatic and solvation dynamics. Particularly, their vibrational frequencies are highly sensitive to local solvent electric field around an IR probe. Here, we show that the experimentally measured vibrational frequency shifts can be inversely used to determine local electric potential and field distributions and solute-solvent electrostatic interaction energy. In addition, the upper limits of their fluctuation amplitudes are estimated by using the vibrational bandwidths. Applying this method to a core/shell model has often been used to describe water confined to the interior of reverse micelles (RMs). This model is composed of fully deutrated N-methylacetamide (NMA-d7) in D2O / Aerosol OT / isooctane. Additionally, we could control the size of RMs (Wo=2~60). Water molecules in confined environments with pools a few nanometers in diameter (dwp=2~20nm) or at interfaces undergo hydrogen bond structural dynamics that differ drastically from the dynamics they undergo in bulk water. Therefore, amide I’ vibration mode of NMA-d7 in reverse micelles is influenced by solvent electric field produced by surrounding water molecules, differently for size. Finally, we found that the solvent electric field produced by surrounding water molecule on the NMA from FR-IR spectra. From the results, we found that solvent electric field is increase as size of RMs decrease. This indicates that the peptide-solvent interactions in nanometer scale water pools are different from the interactions they undergo in bulk solution.

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