<div class="csl-bib-body">
<div class="csl-entry">Hermann, D.-R., Ramer, G., & Lendl, B. (2023). Towards chiral monitoring - Quantum cascade lasers for rapid vibrational circular dichroism. In <i>Anakon 2023 Book of Abstracts</i> (pp. 428–428). TU Wien.</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/193808
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dc.description.abstract
Introduction
Chirality is an integral part of chemistry, being present in small molecules and biological macromolecules like proteins.[1] It is accessible by specialised techniques, among them nuclear magnetic resonance and X-ray crystallography. However, if a label and pre-treatment free technique is needed, only chiroptical spectroscopy techniques, like Vibrational Circular Dichroism (VCD) are worth considering. VCD operates in the infrared region and is therefore broadly applicable for structure elucidation. Unfortunately, VCD is characterised by weak signal amplitudes (10-5 – 10-6 compared to classical absorbance).[1] Consequently, typical measurements take several hours to achieve satisfactory signal to noise ratios.
Methods
To overcome the limitations of VCD, a quantum cascade laser (QCL) based VCD setup was constructed. The inherent linear polarised emission of the QCL was directly used for polarisation modulation spectroscopy. To deal with the noise introduced by the QCL, a balanced detection scheme was applied. This technique compensates the laser noise and allows the leveraging of the QCL to its full potential. As a result of these modifications, it was possible to collect VCD spectra with a low noise floor and relatively high spectral resolution within measurement times below 3 minutes.
Results
We report low noise VCD spectra of model molecules in solution with a time resolution significantly higher than the state of the art. We investigated mixtures of R/S-1,1′-Bi-2-naphthol in CHCl3 at concentrations between 40 and 100 mM. The used setup was designed to simulate on-line measurements of chiral reactions, as preliminary step towards chiral monitoring. The accumulated data was subsequently evaluated in terms of enantiomeric excess prediction by multivariate statistics. The results show a satisfactory performance of QCL-VCD for fast chiral monitoring and indicate possible further applications of this technique.
Innovative aspects
• Establishment of non-destructive chiral analytics with a high time resolution
• Use of quantum cascade lasers for high quality vibrational circular dichroism
• Preliminary steps towards on-line chiral analytics
en
dc.description.sponsorship
FFG - Österr. Forschungsförderungs- gesellschaft mbH
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dc.language.iso
en
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dc.subject
quantum cascade laser
en
dc.subject
Vibrational circular dichroism
en
dc.title
Towards chiral monitoring - Quantum cascade lasers for rapid vibrational circular dichroism
en
dc.type
Inproceedings
en
dc.type
Konferenzbeitrag
de
dc.relation.isbn
978-3-200-09056-9
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dc.description.startpage
428
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dc.description.endpage
428
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dc.relation.grantno
868.615
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dc.type.category
Abstract Book Contribution
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tuw.booktitle
Anakon 2023 Book of Abstracts
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tuw.relation.publisher
TU Wien
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tuw.relation.publisherplace
Vienna
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tuw.project.title
COMET Zentrum CHASE - Chemical Systems Engineering
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tuw.researchTopic.id
Q1
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tuw.researchTopic.name
Photonics
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tuw.researchTopic.value
100
-
tuw.linking
http://hdl.handle.net/20.500.12708/191614
-
tuw.publication.orgunit
E164-02-1 - Forschungsgruppe Prozessanalytik
-
dc.description.numberOfPages
1
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tuw.author.orcid
0000-0001-8307-5435
-
tuw.author.orcid
0000-0003-3838-5842
-
tuw.event.name
Anakon 2023
en
tuw.event.startdate
11-04-2023
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tuw.event.enddate
14-04-2023
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Wien
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tuw.event.country
AT
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tuw.event.institution
TU Wien
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tuw.event.presenter
Hermann, Daniel-Ralph
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tuw.event.track
Multi Track
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wb.sciencebranch
Chemie
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wb.sciencebranch
Physik, Astronomie
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wb.sciencebranch.oefos
1040
-
wb.sciencebranch.oefos
1030
-
wb.sciencebranch.value
60
-
wb.sciencebranch.value
40
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item.openairetype
conference paper
-
item.fulltext
no Fulltext
-
item.openairecristype
http://purl.org/coar/resource_type/c_5794
-
item.grantfulltext
none
-
item.cerifentitytype
Publications
-
item.languageiso639-1
en
-
crisitem.project.funder
FFG - Österr. Forschungsförderungs- gesellschaft mbH
-
crisitem.project.grantno
868.615
-
crisitem.author.dept
E164-02-1 - Forschungsgruppe Prozessanalytik
-
crisitem.author.dept
E164-02-1 - Forschungsgruppe Prozessanalytik
-
crisitem.author.dept
E164-02 - Forschungsbereich Umwelt-, Prozessanalytik und Sensoren
-
crisitem.author.orcid
0000-0001-8307-5435
-
crisitem.author.orcid
0000-0003-3838-5842
-
crisitem.author.parentorg
E164-02 - Forschungsbereich Umwelt-, Prozessanalytik und Sensoren
-
crisitem.author.parentorg
E164-02 - Forschungsbereich Umwelt-, Prozessanalytik und Sensoren
-
crisitem.author.parentorg
E164 - Institut für Chemische Technologien und Analytik