期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 15, 期 40, 页码 17263-17267出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp53243g
关键词
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资金
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BD/48295/2008]
- Deutsche Akademie der Naturforscher Leopoldina German National Academy of Sciences for a Leopoldina research fellowship [LPDS 2011-18]
- German Research Foundation (DFG) [SFB 658]
- European Research Council (ERC) [ERC-2012-STG 308117, 210999]
- European Science Foundation (ESF) [P2M]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/48295/2008] Funding Source: FCT
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=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=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=N-stretch VCD response provides an excellent probe of the helical conformation of the N=N bonds in this type of switchable molecular system.
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