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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261016T103000
DTEND;TZID=Europe/Paris:20261016T113000
DTSTAMP:20260918T091036Z
CREATED:20260918T091036Z
LAST-MODIFIED:20260918T091036Z
UID:10000261-1792146600-1792150200@sfp-alpes.fr
SUMMARY:Xavier RIBAS SALAMAÑA (Universitat de Girona)
DESCRIPTION:Supramolecular Nanocages as Masks for Fullerene Regiofunctionalization and Beyond\nRésumé : \nThe design of a confined cavity dictates the type of guest to be encapsulated\, and supramolecular cages are tunable scaffolds that allow the rational design of their cavities. Nowadays\, easily accessible C60 and C70 fullerene mono-adducts are mainly used in any application (1) due to the hampered accessibility to pure alternative fullerene poly-adduct derivatives. In general\, multi-adduct mixtures with uncontrolled regioselectivity (multi-isomers) are obtained\, and chromatographic purification is too costly and time-consuming. Herein\, porphyrin-based supramolecular nanocapsules (2\,3) are used as supramolecular shadow masks to tame the over-reactivity of Bingel-type cyclopropanation reactions and to have full control over the equatorial regioselectivity\nand the number of additions. Furthermore\, the regioselectivity control is finely tuned using a three-shell Matryoshka-like assembly towards synthesizing a single trans-3 bis-Bingel-C60 for the first time (4). Also\, the mask strategy is extended to C60 and C70 for Bingel and Diels-Alder (5\,6). We envision that the described protocol will produce a plethora of derivatives for applications such as solar cells. We will also discuss our recent selective purification of fullertube mixtures and beyond (7\,8). \nReferences :\n1. E. Castro\, L. Echegoyen et al. J. Mater. Chem. C\, 2018\, 6\, 2635.\n2. C. García-Simón\, X. Ribas\, et al. Nat. Commun. 2014\, 5:5557.\n3. C. Fuertes-Espinosa\, X. Ribas\, et al\, Chem 2020\, 6\, 169–186.\n4. E. Ubasart\, X. Ribas\, et al\, Nat. Chem. 2021\, 13\, 420-427.\n5. V. Iannace\, X. Ribas et al\, J. Am. Chem. Soc. 2024\, 146\, 5186−5194.\n6. T. Pèlachs\, X. Ribas et al\, CCS Chem. 2025\, 7\, 703–715\n7. V. Iannace\, X. Ribas et al\, J. Am. Chem. Soc. 2025\, 147\, 36079−36084\n8. V. Iannace\, X. Ribas\, Acc. Chem. Res. 2026\, 59\, 1414−1425 \n_ \nContact : noemie.lalaoui@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/xavier-ribas-salamana-universitat-de-girona/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261016T111500
DTEND;TZID=Europe/Paris:20261016T121500
DTSTAMP:20260918T092550Z
CREATED:20260918T092501Z
LAST-MODIFIED:20260918T092550Z
UID:10000262-1792149300-1792152900@sfp-alpes.fr
SUMMARY:Gyorgy SZALOKI (Université Paul Sabatier – Toulouse)
DESCRIPTION:Towards confined gold catalysis\nRésumé : \nGold complexes have been the subject of an intense research over the past decade.[1] The main driving force to this interest is to impart new reactivity to these complexes\, that can be leveraged in catalysis. In addition to the widely used ligand engineering strategy\,[2] the concept of confining gold complexes within supramolecular cages has also shown a great\npotential.[3] Toste et coll. have demonstrated\, that small cationic gold complexes (LAu+\, L = Me3P)\, generated within anionic cages show a markedly different reactivity compared to their non-confined analogues. However\, the small cavity size of the cage (251 Å3) has not allowed to extend this concept to larger complexes (L = tBuP\, NHC) and substrates. Indeed\, one obstacle\nto overcome is the synthesis of large anionic cages\, that is far from being straightforward.\nIn order to design and synthesize large anionic cages\, we have implemented a rational approach combining modellizations and cavity size calculations.[4] As a result\, we have prepared an anionic\, cyclotricatechylene based supramolecular cage 1 with a large cavity (558 Å3).[5] Recently\, we have been studying the host-guest chemistry of this cage\, in order to prepare the confined gold-catalyst (Au+@1\, Figure 1). The catalytic activity of Au+@1 is being studied\, with special attention to the synthetically challenging gold catalyzed macrocyclizations. \nFigure 1. Concept: Using the confinement effect to alter the reactivity of gold complexes. \nAcknowledgements\nThe CNRS\, the ANR and the French Ministry of Higher Education and Research is gratefully acknowledged for funding. \nReferences\n[1] L. Rochigiani\, M. Bochmann Chem. Rev. 2021\, 121\, 8364.\n[2] J. Rodriguez\, G. Szalóki\, E. D. Sosa Carizzo\, N. Saffon-Merceron\, K. Miqueu\, D. Bourissou Angew. Chem. Int. Ed.\, 2020\, 59\, 1511;\n(b) G. Szalóki\, J. Babinot\, V. Martin-Diaconescu\, S. Mallet-Ladeira\, Y. Garcia-Rodeja\, K. Miqueu\, D. Bourissou Chem. Sci. 2022\, 13\, 10499.\n[3] M. Morimoto\, S. M. Bierschenk\, K. T. Xia\, R. G. Bergman\, K. N. Raymond\, D. F. Toste Nat. Catal. 2020\, 3\, 969.\n[4] J. V. S. Guerra\, L. F. G. Alves\, D. Bourissou\, P. S. Lopes-de-Oliveira\, G. Szalóki J. Chem. Inf. Model. 2023\, 63\, 3772.\n[5] Y. Diack\, S. Mallet-Ladeira\, D. Lesage\, J. V. S. Guerra\, D. Bourissou\, G. Szalóki Chem. Commun. 2025\, 61\, 8003 \n_ \nContact : noemie.lalaoui@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/gyorgy-szaloki-universite-paul-sabatier-toulouse/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261016T133000
DTEND;TZID=Europe/Paris:20261016T153000
DTSTAMP:20260911T131722Z
CREATED:20260911T131722Z
LAST-MODIFIED:20260911T131722Z
UID:10000252-1792157400-1792164600@sfp-alpes.fr
SUMMARY:Soutenance de Thèse par Irene SUAREZ ANTUNA (DCM (équipe CIRe))
DESCRIPTION:Bio-inspired strategies for small molecule activation: from photochemical H2 production to electrochemical CO2 reduction\n_ \nContact : Nathalie.Camerino@univ-grenoble-alpes.fr \n 
URL:https://sfp-alpes.fr/event/soutenance-de-these-par-irene-suarez-antuna-dcm-equipe-cire/
LOCATION:Maison Jean Kuntzmann – amphithéâtre\, 110\, rue de la Chimie\, Saint-Martin-d'Hères\, 38400\, France
CATEGORIES:Soutenance,Soutenance de Thèse
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