【學(xué)術(shù)報(bào)告】Signatures of Chirality Recognition, Transfer, and Amplification: Chiral Molecules Under Resonance and at Interfaces
日期：2023-07-28
閱讀：6570
報(bào)告題目：Signatures of Chirality Recognition, Transfer, and Amplification: Chiral Molecules Under Resonance and at Interfaces
主講人：徐云潔教授 Yunjie Xu，Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6G 2G2
時(shí)間：2023年7月28日（周五）10：30
地點(diǎn)：霞光樓220會(huì)議室
邀請(qǐng)人：車順愛(ài) 教授
報(bào)告人簡(jiǎn)介
Yunjie?Xu?is?a?full?professor?and?Tier?I?(Senior)?Canada?Research?Chair?in?Chirality?and?Chirality?Recognition?in?the?Chemistry?Department?at?the?University?of?Alberta.?Her?research?focuses?characterizing?chirality?and?chiral?recognition/transfer/amplification/?at?the?molecular?level.?Her?group?not?only?applies?vibrational?circular?dichroism,?Raman?optical?activity,?and?rotational?spectroscopy?but?also?develops?new?IR-mass?spectrometry?techniques?to?study?chirality?related?processes?in?the?gas?phase,?in?solution,?and?at?the?liquid-liquid?interfaces.?She?has?published?182?refereed?articles?in?leading?scientific?journals?including?Science,?Angew.?Chem.?Int.?Ed.,?J.?Am.?Chem.?Soc.,?J.?Phys.?Chem.?Lett.?and?Phys.?Rev.?Lett.?
She?has?received?many?awards?and?honors?and?some?recent?ones?are?2019?Gerhard?Herzberg?Award?from?Canadian?Society?for?Analytical?Sciences?and?Spectroscopy,?2020?Philip?J.?Stephens?Award?from?International?Conference?Series?on?Vibrational?Optical?Activity,?2022?Ioannes?Marcus?Marci?Medal?for?outstanding?achievements?in?high?resolution?molecular?spectroscopy,?and?the?exceptional?(highest)?ranking?in?the?2023?NSERC?Discovery?Grant?Competition.?She?was?elected?to?the?Fellowship?of?the?Royal?Society?of?Canada,?Academy?of?Science?in?2018.
報(bào)告摘要
A molecule is chiral if its mirror image cannot be superimposed onto itself. Chirality serves an essential function in life. Our research program centers on understanding mechanisms of chirality recognition, transfer, amplification at the molecular level. To achieve this goal, we apply and develop new spectroscopic tools to characterize structural and dynamical properties of chiral molecules and non-covalent interactions among them. We examine chirality-related properties of systems in different size regimes, from small chiral molecules to atomically precise metal clusters and to metal nanoparticles, under varying conditions, from the gas phase to cold rare gas matrices, solution, and liquid-liquid interfaces. We emphasize the connection among different size regimes and conditions to extract new physical insights into these chirality events.
While carrying out Raman optical activity (ROA) measurements of several transition metal complexes under resonance, we detected very strong chiral Raman signals of achiral solvents. Our search for possible mechanisms let us to the discovery of a new form of chiral Raman spectroscopy called eCP-Raman. eCP-Raman combines two spectroscopies into one: electronic circular dichroism and circularly polarized Raman (CP-Raman). Our results also indicate that many previous resonance ROA measurements may be contaminated with eCP-Raman contributions. I Efforts to extract/predict (near)resonance ROA experimental/theoretically will be described. Lastly, I will discuss a recent chirality recognition study at an organic and water interface using interfacial tension measurements and MD simulations.
