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Water lubricates hydrogen-bonded molecular machines
Matthijs R Panman1, Bert H Bakker, David den Uyl
1Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.
Nature Chemistry
|October 25, 2013
Summary
Adding water significantly speeds up molecular machines, acting as a lubricant. This discovery sheds light on water
Area of Science:
- Molecular Machines
- Supramolecular Chemistry
- Nanotechnology
Background:
- Macroscopic machinery relies on friction and lubrication for optimal performance.
- Molecular machines exhibit unique mechanical behaviors distinct from macroscopic systems.
- Understanding molecular-level friction and lubrication is crucial for advancing nanotechnology.
Purpose of the Study:
- To investigate the effect of water on the mechanical behavior of hydrogen-bonded molecular machines.
- To explore the role of water as a lubricant at the molecular scale.
- To compare the lubricating effects of water with other protic solvents.
Main Methods:
- Time-resolved vibrational spectroscopy
- NMR-lineshape analysis
Main Results:
- Water significantly accelerates the relative motion of components in hydrogen-bonded molecular machines.
- Both translational (macrocycle on a thread) and rotational (molecular wheel on an axle) movements were enhanced.
- Other protic liquids showed weaker or opposing effects compared to water.
Conclusions:
- Water acts as a potent lubricant for molecular machinery by forming a 3D hydrogen-bond network.
- This finding suggests a general mechanism for water's lubricating role in biological systems.
- Highlights the potential of water in designing and optimizing molecular devices.
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