Two Prizes during JACC2022 conference
Two prizes were delivered during JACC2022 :
- Paola Matozzo (Univ. Rennes-PhD student at ISCR) for the poster prize for her presentation on ''Exciton coupling chirality in helicene-porphyrin conjugates''
- Nicolas Bruni (Univ. Bordeaux-PhD student at LOMA) for the young talk prize for his presentation on ''Directed morphogenesis of rewritable chiral liquid crystal supramolecular structures by chiral light''
GDR PES “Photo-Electro-Stimulation”
The ISM will host the next symposium of the GDR PES "Photo-Electro-Stimulation". The goal of this GDR is to put together photochemists, spectroscopists and electrochemists to discuss about the interplay between these fields. The forthcoming symposium will take place from Monday 7th to Wednesday 9th of November at the ENSCBP school in Pessac. Here is the website to register: https://jpes.sciencesconf.org/ You should create an account prior to register in case you do not have already one. Registration is free but compulsory !
INSCRIPTION TO JACC 2022
Journées André Collet de la Chiralité
With as Plenary and Keynote speakers :
- October 4-7 (2022) in a wonderfull place in Biarritz
- deadline for oral abstract submission :
June 15thJuly 15-2022
- deadline for poster abstract submission : August 31, 2022
- early bird registration starting :
July 1rstJuly 24, 2022
With as Plenary and Keynote speakers :
- Melanie Schnell
- Tiziana Benincori
- Marie-Claire Schanne Klein
- Hiroshi Yamamoto
- Eric Meggers
- Etienne Brasselet
- Mathieu Raynal
- Benjamin Abécassis
- Jess Wade
- Félix Freire
Kick-off meeting of ANR-CHIMERA
CHIMERA standing for Chiral Induction from Microns to Electrons for Radiative Anisotropy, also in collaboration with Yann Battie (LCP-A2MP-Université de Lorraine/Metz)
Upcoming virtual event for Chirality.
the First Virtual Symposium on Chirality hosted by our very own Associate Editor, Prof. Oliver Trapp. The virtual symposium will take place on Tuesday, 22 February 2022 from 12:00 PM UTC to 2:30 PM UTC Register now to attend for free! We welcome three Chirality authors:
- Prof. Tamaki Nakano (Institute for Catalysis (ICAT), Hokkaido University, Japan) Light-induced Conformational Transition of Polymers and Small Molecules
Based on his work: Photo racemization of 2,2′-dihydroxy-1,1′-binaphthyl derivatives --- Chirality, 2021. https://doi.org/10.1002/chir.23400
- Prof. Dr. Alexander Kuhn (Groupe Nanosystèmes Analytiques, Université de Bordeaux, France) Unconventional Electrochemical Approaches for the Direct Readout of Chiral Information
Based on his work: Hybrid light-emitting devices for the straightforward readout of chiral information--Chirality, 2021. https://doi.org/10.1002/chir.23370
- Dr. Peter Wipf (Department of Chemistry, University of Pittsburgh, USA) Enantioselective Imine Additions in the Preparation of Bioactive Lead Compounds Based on his work: Enantioselective synthesis and selective functionalization of 4-aminotetrahydroquinolines as novel glp-1 secretagogues --Chirality, 2021. https://doi.org/10.1002/chir.23403
Laboratory: Chirality journal
PhotoElectron ELiptical Dichroism : PEELD
The resonance-enhanced multiphoton ionization of chiral molecules by elliptically polarized laser pulses produces photoelectron angular distributions that are forward/backward asymmetric with respect to the light propagation axis. We investigate this photoelectron elliptical dichroism in the (2 + 1)-photon ionization of fenchone molecules, using wavelength tunable femtosecond UV pulses. We show that the photoelectron elliptical asymmetry is extremely sensitive to the intermediate resonant states involved in the ionization process, and enables electronic couplings to be revealed that do not show up so clearly when using circularly polarized light.
Revealing the Influence of Molecular Chirality on Tunnel-Ionization Dynamics
The tunneling of a particle through a barrier is one of the most fascinating quantum phenomena. The motion taking place under the barrier, in a region forbidden by classical mechanics, is the subject of intense debate. Many experiments aim at measuring the time taken by the particle to go through the tunnel. Here, we take a completely different direction, revealing the influence of the dynamics under the barrier on the motion of the outgoing particle. Our approach combines two key elements: the barrier is chiral—its structure cannot be superimposed on its mirror image—and it rotates in time. Specifically, our barrier holds the electrons inside a chiral molecule, set spinning by a photoionizing laser field whose polarization rotates. The electrons must pass through the spinning barrier of the molecule to escape.
Optically Active CdSe/CdS Nanoplatelets Exhibiting Both Circular Dichroism and Circularly Polarized Luminescence
In this paper, chiroptical 2D CdSe/CdS nanoplatelets (NPLs) are prepared by ligand exchange approach, exhibiting both circular dichroism (CD) and circularly polarized luminescence (CPL). Furthermore, the CD and CPL signals are easily tuned via the design of the CdS-island structuration of the shell and its thickness which are controlled with the reaction time.
Ultrafast relaxation investigated by photoelectron circular dichroism: an isomeric comparison of camphor and fenchone
Circular dichroism in the photoelectron angular distribution decays exponentially in ∼730 fs from a +9% forward amplitude during the first hundreds of femtoseconds to reach an asymptotic −2% backward amplitude after to have photoexcited at ~6 eV. This time-scale is drastically shorter than in fenchone, its isomer. Our analysis allows us to evaluate the impact of the anisotropy of excitation and reveal a breakdown of the Franck-Condon approximation.
Interdisciplinarity and Chirality
Symmetry and Chirality: Where Physics Shakes Hands with Chemistry and Biology by Laurence Barron
Laboratory: a review article
Direct dynamic read-out of molecular chirality with autonomous enzyme-driven swimmers
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
Chirality induction to achiral molecules by silica-coated chiral molecular assemblies
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
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.
Bipolar electrochemical measurement of enantiomeric excess with inherently chiral polymer actuators
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.
Hybrid light-emitting devices for the straightforward readout of chiral information
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".
Nanoengineered chiral Pt-Ir alloys for high-performance enantioselective electrosynthesis
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.
Nobel prize for Chirality!
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."
Magneto-chiral anisotropy: From fundamentals to perspectives
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/
Magnétisme et chiralité
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)
Bispericyclic Diels–Alder Dimerization of ortho-Quinols in Natural Product (Bio)Synthesis: Bioinspired Chemical 6-Step Synthesis of (+)-Maytenone
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