28-10-2020
Infrared light antenna powers molecular motor
In 1999, Ben Feringa, Professor of Organic Chemistry at the University of Groningen, created the first light-driven molecular motor. These tiny motors could be used in all kinds of nanotechnology applications, for example in the delivery of drugs. However, they are powered by ultraviolet light, which can be harmful. Scientists have been looking for ways to use near-infrared light instead, but all attempts so far have been unsuccessful. Researchers from the University of Groningen now designed an antenna that absorbs energy from near-infrared light. This antenna was attached to the motor molecule, where it transmits the energy directly to the axle that drives motor movement. The result is a motor molecule that is powered by near-infrared light, which brings medical applications one step closer.
This work was published in Science Advances 28 October 2020
Some popular articles on this work :
Science LinX of the University of Groningen
Chemical & Engineering News
Cosmos Magazine
Similarities Emerging from Disorder
29-9-2020
In an all-RUG collaboration, the Optical Condensed Matter Physics and Theory of Condensed Matter Physics (both at the Zernike Institute for Advanced Materials) groups have joined forces with the Molecular Dynamics group (Groningen Biomolecular Sciences and Biotechnology Institute) to obtain a complete picture of the static and dynamic fluctuations of individual molecular nanotubes – an artificial analogue of natural light-harvesting antennae. The researchers used a powerful combination of single-molecule photoluminescence, ultrafast correlation spectroscopies, and theoretical multiscale modeling to obtain quantitative description of the molecular scale fluctuations in large supramolecular assemblies. The scientists demonstrated that although there exists considerable disorder at molecular scale, different nanotubes are remarkably similar to each other in their optical properties, because the disorder at the optical level is strongly suppressed by intermolecular interactions. This marks an important step towards a complete understanding of how delocalized excited states in large self-assembled systems are spatially and temporally constrained and mobilized by static and dynamic disorder.
The results of this work are published in The Journal of the American Chemical Society (B. Kriete, A. S. Bondarenko, R. Alessandri, I. Patmanidis, V. V. Krasnikov, T. L. C. Jansen, S. J. Marrink, J. Knoester, and M. S. Pshenichnikov, “Molecular versus excitonic disorder in individual artificial light-harvesting systems”, Journal of the American Chemical Society., 2020; JACS first online 28 September 2020).
“Why disordered light-harvesting systems produce ordered outcomes” -- popular story by Rene Fransen (in English)
NWO Grant Awarded
5-8-2020
Maxim Pchenitchnikov together with Thomas Jansen (Theory of Condensed Matter group were awarded a Dutch Research Council (NWO) grant for the proposal entitled “Self-assembly pathways of an artificial light harvesting complex”. The aim of the project is to study how thousands and thousands of molecules organize themselves into highly-ordered functional structures without external guidance. The key to elucidating self-assembly intermediate stages and their kinetics is to confront the spectroscopic data with those predicted theoretical calculations.
TPA / TCBD derivatives potential candidates for photovoltaic applications
4-8-2020
Despite the fact that push-pull molecules based on Triphenylamine (TPA)/Tetracyanobutadiene (TCBD) strongly absorb in the visible spectrum, they do not show detectable photoluminescence in solution which is in agreement with the short excited state depopulation time of ~ 10 ps. The latter significantly increases in the solid state making TPA / TCBD derivatives potential candidates for photovoltaic applications.
This was published by Benedito Raul et al. as part of the SEPOMO network, a Horizon 2020 Marie Sklodowska-Curie ITN Programme.
Triphenylamine/Tetracyanobutadiene-based π-Conjugated Push-Pull Molecules End-capped with Arene Platforms: Synthesis, Photophysics, and Photovoltaic Response
Published in : Chem. Eur. J. 10.1002/chem.202002810
PhD defence Björn Kriete
May 8, 2020
On May 8, 2020, Björn Kriete succesfully defended his PhD thesis, entitled "Exciton Dynamics in Self-Assembled Molecular Nanotubes".
The degree was awarded with the distinction : Cum Laude.