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Your search keyword '"ERC-CoG-MULTIPROSMM [725184]"' showing total 3 results
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3 results on '"ERC-CoG-MULTIPROSMM [725184]"'

1. Tailored Lewis Acid Sites for High-Temperature Supported Single-Molecule Magnetism

Author

Moritz Bernhardt, Maciej Damian Korzyński, Zachariah James Berkson, Fabrice Pointillart, Boris Le Guennic, Olivier Cador, Christophe Copéret, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), ETH Zurich Grant program [ETH-44 18-1], ETH Zurich Postdoctoral Fellowships program [FEL-23 19-1], ETH+ Project SynMatLab, ETH Career Seed Award, and ERC-CoG-MULTIPROSMM [725184]

Subjects
[CHIM]Chemical Sciences
Abstract

Generating or even retaining slow magnetic relaxationin surfaceimmobilized single-molecule magnets (SMMs) from promising molecularprecursors remains a great challenge. Illustrative examples are organolanthanidecompounds that show promising SMM properties in molecular systems,though surface immobilization generally diminishes their magneticperformance. Here, we show how tailored Lewis acidic Al-(III) siteson a silica surface enable generation of a material with SMM characteristicsvia chemisorption of (Cp-ttt)(2)DyCl ((Cp-ttt)(-) = 1,2,4-tri-(tert-butyl)-cyclopentadienide).Detailed studies of this system and its diamagnetic Y analogue indicatethat the interaction of the metal chloride with surface Al sites resultsin a change of the coordination sphere around the metal center inducingfor the dysprosium-containing material slow magnetic relaxation upto 51 K with hysteresis up to 8 K and an effective energy barrier(U (eff)) of 449 cm(-1),the highest reported thus far for a supported SMM., Journal of the American Chemical Society, 145 (23), ISSN:0002-7863, ISSN:1520-5126

Published
2023
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2. Cyclooctatetraenide-based single-ion magnets featuring bulky cyclopentadienyl ligand

Author

Maciej Damian Korzyński, Moritz Bernhardt, Vladyslav Romankov, Jan Dreiser, Guy Matmon, Fabrice Pointillart, Boris Le Guennic, Olivier Cador, Christophe Copéret, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Paul Scherrer Institute (PSI), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), ETH Zurich Grant program [ETH-44 18-1], ERC-CoG-MULTIPROSMM [725184], Swiss National Science Foundation [200020_182599], and European Project: 725184,H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC),MULTIPROSMM(2017)

Subjects
[CHIM]Chemical Sciences, General Chemistry
Abstract

We report a family of organometallic rare-earth complexes with the general formula (COT)M(Cp-ttt) (where (COT)(2-) = cyclooctatetraenide, (Cp-ttt)(-) = 1,2,4-tri(tert-butyl)cyclopentadienide, M = Y(iii), Nd(iii), Dy(iii) and Er(iii)). Similarly to the prototypical Er(iii) analog featuring pentamethylcyclopentadienyl ligand (Cp*)(-), (COT)Er(Cp-ttt) behaves as a single-ion magnet. However, the introduction of the sterically demanding (Cp-ttt)(-) imposes geometric constraints that lead to a simplified magnetic relaxation behavior compared to the (Cp*)(-) containing complexes. Consequently, (COT)Er(Cp-ttt) can be viewed as a model representative of this organometallic single-ion magnet architecture. In addition, we demonstrate that the increased steric profile associated with the (Cp-ttt)(-) ligand permits preparation, structural characterization and interrogation of magnetic properties of the early-lanthanide complex, (COT)Nd(Cp-ttt). Such a mononuclear derivative could not be obtained when a (Cp*)(-) ligand was employed, a testament to larger ionic radius of this early lanthanide ion., Chemical Science, 13 (35), ISSN:2041-6520, ISSN:2041-6539

Published
2022
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3. Ytterbium-Centered Isotopic Enrichment Leading to a Zero-Field Single-Molecule Magnet

Author

Haiet Douib, Fabrice Pointillart, Jessica Flores Gonzalez, Boris Le Guennic, Olivier Cador, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), ERC-COG MULTIPROSMM 725184, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Ytterbium, Isotope, Field (physics), Physical and chemical processes, 010405 organic chemistry, Zero (complex analysis), chemistry.chemical_element, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Inorganic Chemistry, Magnetization, Isotopes, chemistry, Zero field, Magnetic properties, Molecular interactions, [CHIM]Chemical Sciences, Single-molecule magnet, Physics::Atomic Physics, Physical and Theoretical Chemistry, Atomic physics, Quantum tunnelling
Abstract

International audience; An unprecedented combination of isotopic enrichment and magnetic dilution approaches for a prolate ytterbium(III)-based complex was performed. It results in the appearance of the first observations of a nuclear spin effect on both quantum tunneling of magnetization and slow magnetic relaxation for an ytterbium complex under a zero applied field.

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