Light-driven brake stops molecular machines

July 1, 2008
Molecular machines (either synthetic or biological) are defined as molecules or groups of molecules that perform mechanical-like movements in response to certain stimuli (light, electricity, or chemical energy).

Molecular machines (either synthetic or biological) are defined as molecules or groups of molecules that perform mechanical-like movements in response to certain stimuli (light, electricity, or chemical energy). Because a braking system is important for any moving object, researchers at National Taiwan University and Academia Sinica (both in Taipei, Taiwan) have developed the first light-driven, room-temperature molecular brake.

Based on nuclear magnetic resonance (NMR) studies, spectral simulations, and molecular modeling, it is possible to calculate the rotation rate of the rigid pentiptycene group, a four-bladed wheel structure that can exhibit two different motion states (trans-1 and cis-1). In dichloromethane solution at 298 K, the pentiptycene wheel freely rotates in a trans-1 state but slows by nine orders of magnitude in the cis-1 state. The two states can be switched by using different wavelengths of light (306 and 254 nm) due to the wavelength-sensitive dinitrostyryl group within the pentiptycene. This molecular “brake” could be attached to other molecular machines in solution to effectively control or stop their motion as a function of illumination wavelength. Contact Jye-Shane Yang at [email protected].

Sponsored Recommendations

Achromatic Lenses: High-Quality Custom Optics

March 13, 2025
Ensure clarity and accuracy in your optics systems with Lacroix’s achromatic lenses. Explore how our custom solutions minimize chromatic aberration for perfect results.

Manufacturing Considerations for Tolerancing Aspheres

March 13, 2025
Understand the critical factors in manufacturing aspheres and how Lacroix Optics ensures precise tolerancing in every optical component.

Explore Our Videos: Insights into Precision Optics

March 13, 2025
Get an inside look at Lacroix Optics with our collection of informative videos showcasing our capabilities, innovations, and processes.

Optical Assemblies: Reliable and Precise Solutions

March 13, 2025
Ensure your optical system works seamlessly with Lacroix Optics' custom optical assemblies. Discover the precision and reliability we bring to every project.

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!