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Title: Chrial discrimination by TERS
Authors: Sukmanee, Thanyada
Wongravee, Kanet
Kitahama, Yasutaka
Ekgasit, Sanong
Itoh, Tamitake
Pienpinijtham, Prompong
Ozaki, Yukihiro
Keywords: Science::Chemistry
Issue Date: 2020
Source: Sukmanee, T., Wongravee, K., Kitahama, Y., Ekgasit, S., Itoh, T., Pienpinijtham, P., & Ozaki, Yu. (2020). Chrial discrimination by TERS. Proc. Of the 7th Asian Spectroscopy Conference (ASC 2020). doi:10.32655/ASC_8-10_Dec2020.23
metadata.dc.contributor.conference: Asian Spectroscopy Conference 2020
Abstract: Tip-enhanced Raman scattering (TERS) using a silver tip that is chemically modified by an achiral para-mercaptopyridine (pMPY) probe molecule has been utilized for chiral discrimination. Differences in the relative intensities of the pMPY bands in the TERS spectra were used to monitor three pairs of enantiomers containing hydroxy (-OH) and/or amino (-NH2) groups. The ND or N+-H functionality of the pMPY-modified tip is concerned with hydrogen-bond interactions with a particular molecular orientation of each chiral isomer. The asymmetric arrangement of silver atoms at the apex of the tip causes an asymmetric electric field, which makes the tip a chiral center. Variations in the charge-transfer (CT) states of the metal-achiral probe system in conjunction with the asymmetric electric field cause different enhancements in the Raman signals of the two enantiomers. The near-field effect of the asymmetric electric field induces further chiral discrimination.
DOI: 10.32655/ASC_8-10_Dec2020.23
Research Centres: Institute of Advanced Studies 
Rights: © 2020 Nanyang Technological University.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:Asian Spectroscopy Conference

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