A Peptide Co Solvent In A Chirality Induction Model System: Broadband Rotational Spectroscopy Of The 2,2,2-trifluoroethanol- -propyl Ene Oxide Adduct

Xu, Yunjie

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https://hdl.handle.net/2142/51213 Copy

Description

Title

A Peptide Co Solvent In A Chirality Induction Model System: Broadband Rotational Spectroscopy Of The 2,2,2-trifluoroethanol- -propyl Ene Oxide Adduct

Author(s)

Xu, Yunjie

Contributor(s)

Thomas, Javix

Issue Date

2014-06-17

Keyword(s)

Structure determination

Abstract

Chirality induction in a model system, i.e. the 2,2,2-trifluoroethanol (TFE)- -propylene oxide (PO) adduct, was investigated in detail using chirped pulse and cavity based Fourier transform microwave spectroscopy, complemented with high level ab initio calculations. Hydrogen-bonding interaction of TFE with the permanently chiral PO molecule results in eight binary TFE- -PO diastereomers. Rotational spectra of four of them were observed experimentally and unambiguously assigned and identified. Unlike the TFE dimer where an extreme case of chirality synchronization was previously reported, diastereomers due to both the g+ and g- forms of TFE were observed, indicating that the tunneling between the two isoenergetic gauche forms of TFE was quenched. Comparison to the previous studies reveals that perfluorination increases the hydrogen-bonding energy by about 70\% over its ethanol counterpart. TFE- -PO serves as a prototype system for chirality induction which leads to chirality amplification rather than a system with chirality synchronization.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51213

DOI

https://doi.org/10.15278/isms.2014.TE11

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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