Light-driven spring: Smart photoswitchable foldamers composed entirely of azobenzene repeat units adopt stable helical structures in the dark and can be readily and reversibly unfolded upon UV irradiation as indicated by vanishing circular dichroism signals (see picture). Variation of the oligomer length leads to optimization of the performance of the foldamers and hence quantitative light-induced unfolding and re-folding.
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Yu et al. (2011) studied this question.
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