Chrial discrimination by TERS
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...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Conference Paper |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/144242 |
| _version_ | 1826115639712940032 |
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| author | Sukmanee, Thanyada Wongravee, Kanet Kitahama, Yasutaka Ekgasit, Sanong Itoh, Tamitake Pienpinijtham, Prompong Ozaki, Yukihiro |
| author2 | Asian Spectroscopy Conference 2020 |
| author_facet | Asian Spectroscopy Conference 2020 Sukmanee, Thanyada Wongravee, Kanet Kitahama, Yasutaka Ekgasit, Sanong Itoh, Tamitake Pienpinijtham, Prompong Ozaki, Yukihiro |
| author_sort | Sukmanee, Thanyada |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T03:58:25Z |
| format | Conference Paper |
| id | ntu-10356/144242 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:58:25Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1442422020-10-22T20:10:39Z Chrial discrimination by TERS Sukmanee, Thanyada Wongravee, Kanet Kitahama, Yasutaka Ekgasit, Sanong Itoh, Tamitake Pienpinijtham, Prompong Ozaki, Yukihiro Asian Spectroscopy Conference 2020 Institute of Advanced Studies Science::Chemistry TERS Chirality 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. Published version 2020-10-22T02:45:02Z 2020-10-22T02:45:02Z 2020 Conference Paper 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 https://hdl.handle.net/10356/144242 10.32655/ASC_8-10_Dec2020.23 en © 2020 Nanyang Technological University. application/pdf |
| spellingShingle | Science::Chemistry TERS Chirality Sukmanee, Thanyada Wongravee, Kanet Kitahama, Yasutaka Ekgasit, Sanong Itoh, Tamitake Pienpinijtham, Prompong Ozaki, Yukihiro Chrial discrimination by TERS |
| title | Chrial discrimination by TERS |
| title_full | Chrial discrimination by TERS |
| title_fullStr | Chrial discrimination by TERS |
| title_full_unstemmed | Chrial discrimination by TERS |
| title_short | Chrial discrimination by TERS |
| title_sort | chrial discrimination by ters |
| topic | Science::Chemistry TERS Chirality |
| url | https://hdl.handle.net/10356/144242 |
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