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Chiral molecules have been photographed for the first time using an atomic-scale resolution

24.03.2023
The research, led by the CNR-IFN, was conducted at the laboratories of the Elettra Synchrotron Research Centre in Trieste and the results achieved were published in Physical Review X.
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An international research team led by Milan’s Institute of Photonics and Nanotechnologies – part of the National Research Council (Cnr-lfn) – has used an innovative approach to investigate the chirality of molecules, an essential property to develop technologically innovative solutions in the fields of materials science, pharmaceutics, and catalysis processes. The study was conducted at the laboratories of the Elettra Synchrotron Research Centre in Trieste, home to the FERMI free-electron laser. This is a last generation instrument that has enabled chirality at the level of individual atoms to be “photographed” during an ultrafast process. The results of the study have been published in the scientific journal Physical Review X.

“A chiral molecule is not superimposable on its mirror image: in other words, it is a molecule that does not have mirror symmetry, and that exists in two different forms, called enantiomers, which cannot be superimposed by rotation or translation”, explained Caterina Vozzi, director of Cnr-lfn. “Understanding this property is important to many aspects of chemistry, biology and physics: the chemical reactivity and biological and pharmacological activity of chiral molecules can vary significantly depending on the configuration of the enantiomers. In applications with these complex molecules, it is therefore important to understand how each atom contributes to total chirality, especially during chemical reactions”.

In the study, the variation of the chiral properties of a molecule were analysed over time using the radiation produced by a free electron laser (FEL), a cutting-edge technology that produces extremely intense and short pulses of light, lasting a few femtoseconds (1 femtosecond corresponds to a millionth of a billionth of a second).

“The FERMI free electron laser is the only one in the world capable of producing pulses of circularly polarized light capable of exploring these phenomena. This type of light is able to provide detailed information on the structure and dynamics of molecules, opening up new perspectives in basic and applied research ”, added Oksana Plekan, researcher at Elettra Sincrotrone Trieste, co-author of the study.

“In this study, we have shown how the chirality of a molecule changes during an ultrafast process when we observe it from the perspective of the atoms forming it. This ability to observe chirality from multiple points of view is similar to stereoscopic vision in humans, thanks to which we can perceive the depth and three-dimensionality of the world around us”, stated Davide Faccialà, researcher at Cnr-Ifn and first author of the study. “The technique we have demonstrated enables us to observe in real time how the chirality of a molecule changes at an unprecedented level of detail, opening up new avenues for understanding the chemical and physical properties of chiral molecules in chemical reactions”.

The study demonstrated the importance of combining expertise in different scientific fields to achieve innovative results in research.

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The Italian Institute for the Structure of Matter (Istituto di struttura della materia — Ism) of the National Research Council (Consiglio nazionale delle ricerche — Cnr), the French National Centre of Scientific Research (Centre national de la recherche scientifique) and the University of Bordeaux (France), the University of Nottingham (UK), the German Electron Synchrotron (Deutsches Elektronen-Synchrotron) and the University of Hamburg (Germany), the Polytechnic University of Milan (Politecnico di Milano) (Italy), the University of Nova Gorica (Slovenia), the Sincrotrone Soleil (France) and the University of Tokyo (Japan) contributed to the research.