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Terminal Ligand and Packing Effects on Slow Relaxation in an Isostructural Set of [Dy(H 2 dapp)X 2 ] + Single Molecule Magnets **
Author(s) -
Pfleger Rouven F.,
Schlittenhardt Sören,
Merkel Marcel P.,
Ruben Mario,
Fink Karin,
Anson Christopher E.,
Bendix Jesper,
Powell Annie K.
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202102918
Subject(s) - isostructural , counterion , chemistry , crystallography , magnetization , ligand (biochemistry) , relaxation (psychology) , ion , molecule , intermolecular force , stereochemistry , crystal structure , physics , social psychology , psychology , biochemistry , receptor , organic chemistry , quantum mechanics , magnetic field
Abstract 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 compounds 1 and 2 is the presence of short nitrate‐nitrate intermolecular ligand contact opening further lattice relaxation pathways.