Transient two-dimensional vibrational spectroscopy of an operating molecular machine

Matthijs R. Panman (), Chris N. Dijk, Adriana Huerta-Viga, Hans J. Sanders, Bert H. Bakker, David A. Leigh (), Albert M. Brouwer, Wybren Jan Buma and Sander Woutersen ()
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Matthijs R. Panman: University of Amsterdam
Chris N. Dijk: University of Amsterdam
Adriana Huerta-Viga: University of Amsterdam
Hans J. Sanders: University of Amsterdam
Bert H. Bakker: University of Amsterdam
David A. Leigh: University of Manchester
Albert M. Brouwer: University of Amsterdam
Wybren Jan Buma: University of Amsterdam
Sander Woutersen: University of Amsterdam

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Synthetic molecular machines are promising building blocks for future nanoscopic devices. However, the details of their mechanical behaviour are in many cases still largely unknown. A deeper understanding of mechanics at the molecular level is essential for the design and construction of complex nanodevices. Here, we show that transient two-dimensional infrared (T2DIR) spectroscopy makes it possible to monitor the conformational changes of a translational molecular machine during its operation. Translation of a macrocyclic ring from one station to another on a molecular thread is initiated by a UV pulse. The arrival of the shuttling macrocycle at the final station is visible from a newly appearing cross peak between these two moieties. To eliminate spectral congestion in the T2DIR spectra, we use a subtraction method applicable to many other complex molecular systems. The T2DIR spectra indicate that the macrocycle adopts a boat-like conformation at the final station, which contrasts with the chair-like conformation at the initial station.

Date: 2017
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DOI: 10.1038/s41467-017-02278-6

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