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Revealing highly unbalanced energy barriers in the extension and contraction of the muscle-like motion of a [c2]daisy chain

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons21623

Hermann,  Klaus
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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c5cp00315f.pdf
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Zitation

Zhao, Y.-L., Zhang, R., Minot, C., Hermann, K., & Hove, M. A. V. (2015). Revealing highly unbalanced energy barriers in the extension and contraction of the muscle-like motion of a [c2]daisy chain. Physical Chemistry Chemical Physics, 17(18), 18318-18326. doi:10.1039/C5CP00315F.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0027-9ECB-8
Zusammenfassung
Nanoscale muscle-like materials have aroused great interest as they may provide controllable mechanical operations by artificial actuations. Molecular designs to achieve the desired motion at the macroscopic scale in experiments require atomic level understanding. By systematic quantum chemical and molecular dynamics calculations we reveal that the length change is not only due to the linear telescoping from the dibenzo[24]crown-8 recognition at two docking stations but also the folding/unfolding of two bulky stoppers. The extension and contraction processes of a [c2]daisy chain under acid vs. base conditions are exothermic but need to cross very different energy barriers, being at least double the height under acid compared to base conditions, hindering balanced cyclic motions at moderate excitation. Our result suggests that to realize the desired muscle-like motion one should adopt sufficiently high external excitation, using for example reasonably high temperature and further optimize the solution used. Keywords: stretching and contraction, solvent effects, energy profiles, SCC-DFTB-D