Project description DEENESFRITPL Investigating organic chemical reactions at low temperatures Reactions have physicochemical barriers that impede their progress. Catalysts are ubiquitously used to overcome many of these. Heat is also often applied to speed up reactions thanks to the increased motion of particles and their increasing number of collisions. In the far reaches of space and extreme cold, organic molecules are formed without this assistance. One theory is that a combination of quantum-mechanical tunnelling (QMT) and novel reactions with exceptionally low barriers could be the key. The EU-funded COLDOC project is evaluating this hypothesis through investigations that will reveal how QMT controls chemical reactivity and selectivity. This will be complemented by organic synthesis under cryogenic conditions for select compounds of interest. Show the project objective Hide the project objective Objective This proposal ventures into organic chemical reactions under not-so-common conditions, namely in the cold, at insufficient energies, and under the action of hard radiation. As many organic molecules have been discovered in space or brought to earth in meteorites, they must have formed under such conditions through hitherto largely undisclosed mechanisms. One key hypothesis is that quantum-mechanical tunneling (QMT) and novel reactions with exceptionally low barriers are at work. Hence, one of the key objectives is to uncover how QMT, where reactions occur through and not over barriers, controls chemical reactivity and selectivity. A second goal is the examination of cryogenic reactions of hydroxycarbenes or enols with carbonyl compounds. Our methods include organic synthesis of starting materials (also isotopically labelled) and products, infrared as well as ultaviolet/visible matrix-isolation spectroscopy, ab initio computations of structures, spectra, and potential energy surfaces as well as QMT rate calculations. We will examine isotope-selective reactions of competing QMT reactions that can be made selective through strategic isotope incorporation. QMT also offers new ways to activate carbon dioxide and even to catalyze reactions. We propose a unifying synthesis of carbohydrates and alpha-amino acids through a common mechanistic scenario, namely a newly discovered hetero-carbonyl-ene reaction of carbenes or enols in the gas phase. Finally, chemistry far from thermodynamic equilibrium is explored with probing the activation and reaction of highly stable molecules under irradiation with energetic electrons, thereby mimicking conditions of the interstellar medium exposed to galactic cosmic rays. This should shed light on the formation of larger “complex organic molecules” found in this medium and often considered as building blocks for life. Fields of science natural scienceschemical sciencesorganic chemistrynatural scienceschemical sciencesphysical chemistryquantum chemistrynatural sciencesbiological sciencesbiochemistrybiomoleculescarbohydratesnatural sciencesphysical sciencesopticsspectroscopy Programme(s) HORIZON.1.1 - European Research Council (ERC) Main Programme Topic(s) ERC-2021-ADG - ERC ADVANCED GRANTS Call for proposal ERC-2021-ADG See other projects for this call Funding Scheme HORIZON-AG - HORIZON Action Grant Budget-Based Host institution JUSTUS-LIEBIG-UNIVERSITAET GIESSEN Net EU contribution € 2 493 529,00 Address LUDWIGSTRASSE 23 35390 Giessen Germany See on map Region Hessen Gießen Gießen, Landkreis Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Total cost € 2 493 529,00 Beneficiaries (1) Sort alphabetically Sort by Net EU contribution Expand all Collapse all JUSTUS-LIEBIG-UNIVERSITAET GIESSEN Germany Net EU contribution € 2 493 529,00 Address LUDWIGSTRASSE 23 35390 Giessen See on map Region Hessen Gießen Gießen, Landkreis Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Total cost € 2 493 529,00