Skip to ContentSkip to Navigation
Part of University of Groningen
Science LinX Science Linx News

Two light switches combined in one molecule

13 July 2016

University of Groningen scientists led by Professor of Organic Chemistry Ben Feringa have developed a molecule containing two separate light switches. Feringa has thus created another tool for building light-controllable functional materials. An article on the double switch was published in the journal Nature Communications on 12 July.

Feringa is a pioneer in catalysis, molecular motors and molecular switches. An inspiring example of the possible applications of his work is an antibiotic containing a light-controlled ‘on/off-switch’ . But so far, the control has only been binary. A double switch would offer more flexibility, but the problem is to find two switches that don’t interfere with each other.

Several classes of light-controlled molecular switches are available, but it is hard to find two that respond to non-overlapping wavelengths. Only then is it possible to control them individually. In the Nature Communications article, the University of Groningen scientists describe how they found two such switches and brought them together in one molecule.

Schematic illustration of a molecule with two light operated switches | Illustration Ben Feringa / Nature Communications
Schematic illustration of a molecule with two light operated switches | Illustration Ben Feringa / Nature Communications

The two switches are a ‘Donor-Acceptor Stenhouse Adduct’ (DASA) and an azobenzene. Feringa and colleagues describe how they first managed to control the two switches separately in a solution containing both molecules. They then produced a single molecule containing both switches and discovered that the two switches did not affect each other’s operation, once they had taken some precautionary measures.

Ben Feringa | Phtoto Science LinX
Ben Feringa | Phtoto Science LinX

The DASA switch can change the solubility of the molecule: first it is soluble in water but after switching it is more at home in toluene. In a test tube containing separate layers of toluene and water, the molecule will migrate once white light triggers the switch.

The azobenzene switch can make the molecule bind to a circular organic compound known as cyclodextrin . A molecule containing both switches can thus be made to pick up a cyclodextrin ring and transport it from water to toluene. The binding properties and the location can be managed, using ultraviolet and white light respectively.

As Feringa explains, this opens the door to smart materials with properties that can be controlled in a non-invasive and reversible manner. ‘It is still early days, but if you can switch two properties independently, you might for example use this to transport molecules through a cell membrane. And you could also design a double-action light-controlled catalyst.’ But, he adds, ‘to realize this will take a lot of hard work!’

Reference: Michael M. Lerch, Mickel J. Hansen, Willem A. Velema, Wiktor Szymanski & Ben L. Feringa: Orthogonal photoswitching in a multifunctional molecular system . Nature Communications 12 July 2016, doi:10.1038/ncomms12054

Recent news featuring Ben Feringa :

Last modified:14 July 2016 3.09 p.m.
View this page in: Nederlands

More news

  • 16 April 2024

    UG signs Barcelona Declaration on Open Research Information

    In a significant stride toward advancing responsible research assessment and open science, the University of Groningen has officially signed the Barcelona Declaration on Open Research Information.

  • 02 April 2024

    Flying on wood dust

    Every two weeks, UG Makers puts the spotlight on a researcher who has created something tangible, ranging from homemade measuring equipment for academic research to small or larger products that can change our daily lives. That is how UG...

  • 18 March 2024

    VentureLab North helps researchers to develop succesful startups

    It has happened to many researchers. While working, you suddenly ask yourself: would this not be incredibly useful for people outside of my own research discipline? There are many ways to share the results of your research. For example, think of a...