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March 09, 2006

Molecular motors rotates objects 10,000 times its size

This is a further advance along light actuated molecular motion.

Ben Feringa and colleagues used a molecule with a central carbon-carbon double bond that functioned as an axle. The upper part of the molecule acted as a rotor while the lower part was the stator. The team added the molecules to a liquid crystal film and illuminated them with light with a wavelength of 365 nm.

The light caused a photochemical isomerization around the double bond and changed the helicity of the molecule from right- to left-handed. A thermal step then caused the molecule to revert to its right-handed state. Two sets of a photochemical step followed by a thermal step resulted in the molecule rotating through 360°.

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