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DTSTART;TZID=Europe/Paris:20260507T100000
DTEND;TZID=Europe/Paris:20260507T113000
DTSTAMP:20260710T021713
CREATED:20260414T144001Z
LAST-MODIFIED:20260504T195815Z
UID:5834-1778148000-1778153400@www.cnrs-imn.fr
SUMMARY:Séminaire Chen-Wei Liu
DESCRIPTION:Chen-Wei Liu (劉鎮維) \nNDHU chair professor\, Department of Chemistry\, National Dong Hwa University\, \nHualien\, Taiwan 97401 \nchenwei@gms.ndhu.edu.tw \n  \nHydride-doped Coinage Metal Nanoclusters: From Superatomic Alloys to Superclusters \nHydride\, H- (1s2)\, the smallest closed shell anion\, is a one-negative charge ligand widely used to stabilize metallic compounds. Aside from its characteristic NMR signals\, detailed characterizations of hydride location within metal clusters are problematic due to its near-invisible X-ray scattering length. Therefore\, chemists working on polyhydrido metal clusters must be very cautious. In 2009\, the Liu group first succeeded in the isolation of a hydride insertion product\, Cu8(H)L6 (L = E2PR2\, E = S\, Se)\, where significant metal kernel distortions compared to an empty CuI 8 cube (stabilized by six dichalcophosphate ligands) suggested the additional hydride was located at the center of Cu8 cage. This work kicks off the chemistry of coinage metal hydrides created by the Liu group. During a span of 17 years\, we have uncovered four important concepts: (1) hydride additions can assist the growth of nanoscale copper clusters\, (2) interstitial hydrides in nanoclusters can reduce M(I) (M = Cu\, Ag\, Au) to M(0) and form stable superatoms\, (3) the interstitial hydride coordinated to Ni\, Pd\, Pt\, Rh\, Ir\, Ru within Ag- and Cu-rich clusters can behave as “metallic” hydrogen (i.e. to provide its 1s(H) electron to the cluster electron count)\, (4) the first synthesis of a three-dimensional self-assembled supercluster formed by the tetrahedral arrangement of four IrH2@Ag12 icosahedra\, reminiscent of a tetrahedrane. This presentation will focus on the synthesis\, structures\, and bonding of hydride-doped precious metal nanoclusters\, which are indeed structurally precise\, ultra-small nanoparticles\, as well as its remarkable HER activities catalyzed by a 2-electron palladium(platinum)/copper superatomic alloy\, [Pd/Pt/HCu11{S2P(OiPr)2}6(C≡CPh)4]. \n  \nReferences \n[1] Dhayal\, R. S.; van Zyl\, W. E.; Liu\, C. W. Acc. Chem. Res. 2016\, 49\, 86 – 95. \n[2] Sharma\, S.; Chakrahari\, K. K.; Saillard\, J.-Y.; Liu\, C. W. Acc. Chem. Res. 2018\, 51\, 2475 – 2483. \n[3] Artem’ev\, A. V.; Liu\, C. W. Chem. Commun. 2023\, 59\, 7182 – 7195. \n[4] Chiu\, T.-H.; Liao\, J.-H.; Silalahi\, R. P. B.; Pillay\, M. N.; Liu\, C. W. Nanoscale Horiz. 2024\, 9\, 675 – 692. \n  \n  \nContact : Camille Latouche (MIOPS)
URL:https://www.cnrs-imn.fr/event/seminaire-chen-wei-liu/
LOCATION:Amphi 1 Bât. IRESTE Chantrerie
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/04/Chen-Wei_Liu.jpg
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DTSTART;TZID=Europe/Paris:20260507T133000
DTEND;TZID=Europe/Paris:20260507T150000
DTSTAMP:20260710T021713
CREATED:20260417T100835Z
LAST-MODIFIED:20260520T161702Z
UID:5936-1778160600-1778166000@www.cnrs-imn.fr
SUMMARY:Séminaire Jeudis de la Chimie du Solide - João Rocha (CICECO-Aveiro)
DESCRIPTION:Functional Porous Materials: From Transition-Metal and Lanthanide Silicates to MOFs \n \nJoão Rocha \nDepartment of Chemistry\, CICECO-Aveiro Institute of Materials\, University of Aveiro\, Portugal \nBeyond zeolites\, certain microporous silicates constructed from transition metal- and lanthanide-containing heteropolyhedra constitute a particularly promising class of functional materials. In addition to the properties conventionally associated with zeolites\, these materials may also exhibit magnetic and luminescent behaviour of considerable interest. In my laboratory\, we have demonstrated the application potential of these materials in hydrogen/nitrogen separation membranes\, light-emitting devices [1]\, and the treatment of hyperkalaemia (elevated serum K+ levels)\, culminating in the development of a drug that is now available on the market. \nIn parallel\, our research on metal–organic frameworks (MOFs) seeks to exploit the remarkable modularity of these nanoporous hybrid materials\, which are composed of polyatomic metal assemblies interconnected by organic ligands. Although MOFs are generally less robust than zeolitic materials\, they offer a decisive advantage in terms of rational design and post-synthetic functionalisation. Within this context\, we have developed several research directions focused on luminescence-based thermometry\, anti-mosquito textiles\, and the capture of uranyl ions in aqueous media. We have furthermore designed MOFs based on tetrathiafulvalene phosphonates and lanthanide ions\, exhibiting mixed ionic and electronic conductivity [2]\, thereby opening significant prospects for applications in (opto)electronics\, catalysis\, and energy storage. \n______________________ \n[1] Wang\, Z.; Ananias\, D.; Carné-Sánchez\, A.; Brites\, C.D.S.; Imaz\, I.; Maspoch\, D.; Rocha\, J.; Carlos\, L.D. Adv. Funct. Mater. 2015\, 25\, 2824-2830.\n[2] Ribeiro\, C.; Tan\, B.; Figueira\, F.; Mendes\, R.; Calbo\, J.; Valente\, G.; Escamilla\, P.; Paz\, F.A.; Rocha\, J.; Dincă\, M.; Souto\, M. J. Am. Chem. Soc. 2025\, 147\, 63-68. \n  \nhttps://univ-nantes-fr.zoom.us/s/89388274201
URL:https://www.cnrs-imn.fr/event/seminaire-jeudis-de-la-chimie-du-solide-joao-rocha-ciceco-aveiro/
LOCATION:Visioconférence
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/05/Joao_Rocha.jpg
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