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Issue 40, 2013
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Elucidating the backbone conformation of photoswitchable foldamers using vibrational circular dichroism

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Abstract

The backbone conformation of amphiphilic oligo(azobenzene) foldamers is investigated using vibrational circular dichroism (VCD) spectroscopy on a mode involving the stretching of the N[double bond, length as m-dash]N bonds in the backbone. From denaturation experiments, we find that the VCD response in the helical conformation arises mainly from through-space interaction between the N[double bond, length as m-dash]N-stretch transition-dipole moments, so that the coupled-oscillator model can be used to predict the VCD spectrum associated with a particular conformation. Using this approach, we elucidate the origin of the VCD signals in the folded conformation, and can assign the observed partial loss of VCD signals upon photo-induced unfolding to specific conformational changes. Our results show that the N[double bond, length as m-dash]N-stretch VCD response provides an excellent probe of the helical conformation of the N[double bond, length as m-dash]N bonds in this type of switchable molecular system.

Graphical abstract: Elucidating the backbone conformation of photoswitchable foldamers using vibrational circular dichroism

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Article information


Submitted
31 Jul 2013
Accepted
19 Aug 2013
First published
19 Aug 2013

This article is Open Access

Phys. Chem. Chem. Phys., 2013,15, 17263-17267
Article type
Paper

Elucidating the backbone conformation of photoswitchable foldamers using vibrational circular dichroism

S. R. Domingos, S. J. Roeters, S. Amirjalayer, Z. Yu, S. Hecht and S. Woutersen, Phys. Chem. Chem. Phys., 2013, 15, 17263
DOI: 10.1039/C3CP53243G

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