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Water lubricates hydrogen-bonded molecular machines

Research output: Contribution to journalArticle

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Author(s)

Matthijs R. Panman, Bert H. Bakker, David den Uyl, Euan R. Kay, David A. Leigh, Wybren Jan Buma, Albert M. Brouwer, Jan A. J. Geenevasen, Sander Woutersen

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Abstract

The mechanical behaviour of molecular machines differs greatly from that of their macroscopic counterparts. This applies particularly when considering concepts such as friction and lubrication, which are key to optimizing the operation of macroscopic machinery. Here, using time-resolved vibrational spectroscopy and NMR-lineshape analysis, we show that for molecular machinery consisting of hydrogen-bonded components the relative motion of the components is accelerated strongly by adding small amounts of water. The translation of a macrocycle along a thread and the rotation of a molecular wheel around an axle both accelerate significantly on the addition of water, whereas other protic liquids have much weaker or opposite effects. We tentatively assign the superior accelerating effect of water to its ability to form a three-dimensional hydrogen-bond network between the moving parts of the molecular machine. These results may indicate a more general phenomenon that helps explain the function of water as the 'lubricant of life'.

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Original languageEnglish
Pages (from-to)929-934
Number of pages6
JournalNature Chemistry
Volume5
Issue number11
DOIs
Publication statusPublished - Nov 2013

    Research areas

  • RESOLVED VIBRATIONAL SPECTROSCOPY, AQUEOUS-SOLUTIONS, LIQUID WATER, DYNAMICS, SHUTTLE, RELAXATION, ROTAXANES, FRICTION, MOTORS, MOTION

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