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Chiral recognition by fullerenes: CHFClBr enantiomers in the C82 cage

Permanent lenke
https://hdl.handle.net/10037/25375
DOI
https://doi.org/10.1039/c6cp05030a
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Dato
2016-08-18
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
Dodziuk, Helena; Ruud, Kenneth; Korona, Tatiana; Demissie, Taye Beyene
Sammendrag
Density-functional theory and symmetry-adapted perturbation theory calculations on complexes of the enantiomers of CHFClBr with the most stable isomer of C82-3 fullerene show that despite the guests being too large for the host cage, they are nevertheless stabilized by electrostatic interactions. The complexation leads to considerable strain on the cage and the guests accompanied by compression of the bonds of the guest molecule, resulting in considerable complexation-induced changes in the infrared (IR), vibrational circular dichroism (VCD), nuclear magnetic resonance (NMR), and UV-vis spectra. The effect of chiral recognition is pronounced only for the 19F signal in the NMR spectra and in a sign reversal of the rotational strength of the nCH stretching vibration of S-CHFClBr@C82-3 in the VCD spectrum as compared to that of the free guest, making the sign of this band for the C82 complexes with the S- and R-guest enantiomers the same. This is a surprising result since vibrational circular dichroism is considered a reliable method for determining the absolute chirality of small molecules and for establishing dominant conformations in biopolymers.
Forlag
Royal Society of Chemistry
Sitering
Dodziuk, Ruud K, Korona, Demissie TB. Chiral recognition by fullerenes: CHFClBr enantiomers in the C82 cage. Physical Chemistry, Chemical Physics - PCCP. 2016;18(37):26057-26068
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Copyright 2016 The Author(s)

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