2021-10-25
News:
Symmetry and Chirality: Where Physics Shakes Hands with Chemistry and Biology by Laurence Barron
Laboratory :
a review article
Category Archives: news
Direct dynamic read-out of molecular chirality with autonomous enzyme-driven swimmers
2021-10-14
News:
This work describes a first example of autonomous miniaturized swimmers which can detect the chirality of molecules present in solution by adapting their trajectories at the air/water interface. In the presence of one enantiomer they will swimm clockwise, in the presence of the other enantiomer the motion will be anti-clockwise.
See also press release by CNRS
Laboratory :
ISM
Chirality induction to achiral molecules by silica-coated chiral molecular assemblies
2021-07-23
News:
Hybrid silica-organic nanohelices are used to organize a large variety of non-chiral small organic molecules or inorganic anions to nanometer-sized assemblies. Such chiral organization of achiral molecules induces chiroptical properties as detected by vibrational or electronic circular dichroism (CD), as well as from circularly polarized luminescence (CPL). This is a collaborative work with University of Rome Tor Vergata and University of Kumamoto
Hybrid silica-organic nanohelices are used to organize a large variety of non-chiral small organic molecules or inorganic anions to nanometer-sized assemblies. Such chiral organization of achiral molecules induces chiroptical properties as detected by vibrational or electronic circular dichroism (CD), as well as from circularly polarized luminescence (CPL). This is a collaborative work with University of Rome Tor Vergata and University of Kumamoto
Laboratory :
CBMN, ISM
Chirality Induction to CdSe Nanocrystals Self-Organized on Silica Nanohelices: Tuning Chiroptical Properties
2021-10-07
News:
An article on CdSe nanocrystals (NCs) grafted on chiral silica nanoribbons, and the resulting induced circular dichroism observed from the NCs.This work is done in the context of LIA-CNPA by a double degree PhD student between Univ. Bordeaux and Kyoto Univ.
Laboratory :
CBMN
Bipolar electrochemical measurement of enantiomeric excess with inherently chiral polymer actuators
2021-07-19
News:
An article about the direct visual readout of enantiomeric excess with wireless actuators. The work has been performed together with collegues from Milan and Como.
Laboratory :
ISM
Hybrid light-emitting devices for the straightforward readout of chiral information
2021-10-11
News:
A new article on chiral recognition based on enantioselective oligomers addressed by bipolar electrochemistry. The work has been carried out in collaboration with collegues from Milan and Como. It has been published in the special issue of Chirality: "Chirality in France".
Laboratory :
ISM
Nanoengineered chiral Pt-Ir alloys for high-performance enantioselective electrosynthesis
2021-02-26
News:
An article about the highly stereoselective electrosynthesis of enantiomers with the help of chiral encoded metal matrices. The work has been performed with collegues from VISTEC in Thailand.
Laboratory :
ISM
Nobel prize for Chirality!
2021-10-06
News:
Chirality under the spotlight!
"The Nobel Prize in Chemistry 2021 was awarded jointly to Benjamin List and David W.C. MacMillan "for the development of asymmetric organocatalysis."
Laboratory :
nobelprize.org
Magneto-chiral anisotropy: From fundamentals to perspectives
2021-10-01
News:
New review article on magneto-chiral anisotropy with colleagues from Grenoble and Angers for the special issue in Chirality: "Chirality in France".
https://www.icmcb-bordeaux.cnrs.fr/
http://lncmi.cnrs.fr/
https://www.univ-angers.fr/fr/recherche/laboratoires/materiaux/moltech-anjou.html
https://www.icmcb-bordeaux.cnrs.fr/
http://lncmi.cnrs.fr/
https://www.univ-angers.fr/fr/recherche/laboratoires/materiaux/moltech-anjou.html
Laboratory :
ICMCB
Magnétisme et chiralité
2021-05-18
News:
Chirality is the property of objects, and particularly of molecules, to exist in two different forms that are each other’s mirror image. Chirality plays a vital role in biochemistry, as most molecules of life, ranging from sugars and proteins, via most drugs, right up to DNA, are chiral and this property is essential for their action.
Magnetism, despite its millennia-long history, still fascinates. It has found many industrial applications, and new ones are still being developed, spintronics being its most recent offspring.
Since Pasteur, scientists have tried to create a link between chirality and magnetism. Although basically very distinct, the two domains share a common and unique phenomenon called magneto-chiral anisotropy (MChA). MChA corresponds to a change in any flux (light, electrical current, heat, sound, etc.) going through a chiral medium, depending on whether it flows parallel or anti-parallel to an external magnetic field.
The first predictions of MChA for light appeared in the 1980s. Since then several observations of optical MChA have been reported, but the effects were quite weak and no complete quantitative analysis was presented. Now a collaboration of researchers from France and the USA have performed detailed measurements and advanced quantum-chemical calculations on well-defined model systems. They find experimentally that for these materials at low temperatures, the difference in light transmission parallel and anti-parallel to a modest magnetic field of 1 Tesla, hardly more than what a refrigerator magnet produces, can be as high as 10 %. Their calculations permit a detailed understanding of these results, and predict even higher anisotropies at higher fields or lower temperatures. The size of the effect and its in-depth understanding now open the road to applications of MChA, which can range from optical diodes to new optical data storage methods.
(read also in french, Communication by INP-CNRS)
Since Pasteur, scientists have tried to create a link between chirality and magnetism. Although basically very distinct, the two domains share a common and unique phenomenon called magneto-chiral anisotropy (MChA). MChA corresponds to a change in any flux (light, electrical current, heat, sound, etc.) going through a chiral medium, depending on whether it flows parallel or anti-parallel to an external magnetic field.
The first predictions of MChA for light appeared in the 1980s. Since then several observations of optical MChA have been reported, but the effects were quite weak and no complete quantitative analysis was presented. Now a collaboration of researchers from France and the USA have performed detailed measurements and advanced quantum-chemical calculations on well-defined model systems. They find experimentally that for these materials at low temperatures, the difference in light transmission parallel and anti-parallel to a modest magnetic field of 1 Tesla, hardly more than what a refrigerator magnet produces, can be as high as 10 %. Their calculations permit a detailed understanding of these results, and predict even higher anisotropies at higher fields or lower temperatures. The size of the effect and its in-depth understanding now open the road to applications of MChA, which can range from optical diodes to new optical data storage methods.
(read also in french, Communication by INP-CNRS)
Laboratory :
ICMCB