Terminal Ligand and Packing Effects on Slow Relaxation in an Isostructural Set of [Dy(H 2 dapp)X 2 ] + Single Molecule Magnets*.

Autor: Pfleger RF; Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstraße 15, 76131, Karlsruhe, Germany., Schlittenhardt S; Institute of Nanotechnology (INT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany., Merkel MP; Institute of Nanotechnology (INT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany., Ruben M; Institute of Nanotechnology (INT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.; Institut de Science et d'Ingénierie Supramoléculaires (ISIS, UMR 7006), CNRS-Université de Strasbourg, 8 allée Gaspard Monge, BP 70028, 67083, Strasbourg Cedex, France., Fink K; Institute of Nanotechnology (INT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany., Anson CE; Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstraße 15, 76131, Karlsruhe, Germany., Bendix J; Department of Chemistry, University of Copenhagen, Universitetparken 5, 2100, Copenhagen, Denmark., Powell AK; Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstraße 15, 76131, Karlsruhe, Germany.; Institute of Nanotechnology (INT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.; Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2021 Nov 02; Vol. 27 (61), pp. 15085-15094. Date of Electronic Publication: 2021 Oct 14.
DOI: 10.1002/chem.202102918
Abstrakt: We report three structurally related single ion Dy compounds using the pentadentate ligand 2,6-bis((E)-1-(2-(pyridin-2-yl)-hydrazineylidene)ethyl)pyridine (H 2 dapp) [Dy(H 2 dapp)(NO 3 ) 2 ]NO 3 (1), [Dy(H 2 dapp)(OAc) 2 ]Cl (2) and [Dy(H 2 dapp)(NO 3 ) 2 ]Cl 0.92 (NO 3 ) 0.08 (3). The (H 2 dapp) occupies a helical twisted pentagonal equatorial arrangement with two anionic ligands in the axial positions. Further influence on the electronic and magnetic structure is provided by a closely associated counterion interacting with the central N-H group of the (H 2 dapp). The slow relaxation of the magnetisation shows that the anionic acetates give the greatest slowing down of the magnetisation reversal. Further influence on the relaxation properties of compounds1 and 2 is the presence of short nitrate-nitrate intermolecular ligand contact opening further lattice relaxation pathways.
(© 2021 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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