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2022여름초록

제목

Electrochemical Reduction Using Solvated Electron Solution: Impact on the Ionization and Molecular Aggregations

작성자
최윤섭

발표자 및 발표 내용

소속
POSTECH
발표구분
포스터발표
포스터발표
Fundamental & Instrumentation
Brief Oral Presentation 발표신청
신청자에 한함
8/25(목) 09:00~10:00 Brief Oral Presentation 발표자신청 접수
Keyword
Electrochemical reduction
Molecular aggregation

주저자

이름
최윤섭
소속
POSTECH
국가
대한민국

공동저자

공동저자
이름
박상황
소속
POSTECH
국가
대한민국
이름
서종철
소속
POSTECH
국가
대한민국
이름
소속
국가
이름
소속
국가
이름
소속
국가
이름
소속
국가
이름
소속
국가
이름
소속
국가
이름
소속
국가
이름
소속
국가

접수자

이름
최윤섭
소속
POSTECH

Electrospray ionization-mass spectrometry (ESI-MS) is one of the most powerful molecular identification techniques which enables us to measure the mass-to-charge ratio (m/z) of analyte ions with less fragmentation. However, ESI-MS is difficult to use in hardly ionized materials. In many cases, ionization in ESI-MS can be achieved by the transfer of protons or metal cations. Therefore, molecules with no protonation/deprotonation site, or polar functional groups, such as polyaromatic hydrocarbons (PAHs), fullerenes, metal clusters, and several more, are difficult to be detected in ESI-MS. In this study, we have tried to use the solution containing solvated electrons as an additional ionization reagent for ESI-MS. We successfully obtained ESI mass spectra of molecules that are hardly ionized with proton transfer by applying solvated electron solution. Compared to the other reducing reagent, solvated electrons can provide a much higher reducing capability that efficiently produces negatively charged molecules. Furthermore, several charge-reduced molecules exhibit the aggregation behaviors distinct from those without reductions. Representatively, stacked hemin dimers with and without reductions show distinguishable collision cross section values in ion mobility spectrometry, indicating that the molecular charges and their distributions should have significant impact on the aggregation such as π-π stackings. This work suggests a new method to ionize the molecules, which are known to be poorly ionized, by transfer of electrons. Furthermore, this will benefit the diverse studies on the charge-dependent aggregation behavior, since this can provide a rational way to control the molecular charges of the analyte in the ESI solution.


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