A Nanosized {Ni<sup>II</sup><sub>18</sub>} Cluster with a ‘Flying Saucer’ Topology Exhibiting Slow Relaxation of Magnetisation Phenomena at Both 15 K and 1.3 K
A high-nuclearity {Ni<sub>18</sub>} complex (1) with a unique 'flying saucer' motif has been prepared from the organic chelate, α-methyl-2-pyridine-methanol (mpmH), in conjunction with bridging azido (N<sub>3</sub> <sup>-</sup>) and peroxido (O<sub>2</sub> <sup>2-</sup>) ligands. Magnetic susceptibility measurements revealed the presence of both ferro- and antiferromagnetic exchange interactions between the metal centres in 1, and the stabilization of spin states with appreciable S values at two different temperature regimes. The end-on bridging azido and alkoxido groups are in all likelihood the ferromagnetic mediators, while the η<sup>3</sup>:η<sup>3</sup>:μ<sub>6</sub>-bridging peroxides most likely promote the antiparallel alignment of the metals' spin vectors, yielding an overall non-zero spin ground state for the centrosymmetric compound 1. Furthermore, the {Ni<sub>18</sub>} nanosized cluster behaves as a single-molecule magnet, exhibiting magnetic hysteresis at low temperatures and two relaxation processes at 15 K and 1.3 K, a very rare phenomenon in polynuclear magnetic 3d-metal clusters.
Authors
- Theocharis C. Stamatatos (ORCID: https://orcid.org/0000-0002-9798-9331)
- Angeliki A. Athanasopoulou (ORCID: https://orcid.org/0000-0002-8695-2269)
- Christine M. Beavers (ORCID: https://orcid.org/0000-0001-8653-5513)
- John J. Hayward (ORCID: https://orcid.org/0000-0002-7502-7780)
- Dimitris I. Alexandropoulos (ORCID: https://orcid.org/0000-0002-8759-9495)
- Júlia Mayans (ORCID: https://orcid.org/0000-0001-8875-8075)
- Simon J. Teat (ORCID: https://orcid.org/0000-0001-9515-2602)
- Parisa Abbasi
- Melanie Pilkington
- Wolfgang Wernsdorfer (ORCID: https://orcid.org/0000-0003-4602-5257)
- Albert Escuer (ORCID: https://orcid.org/0000-0002-6274-6866)
Institutions
- Karlsruhe Institute of Technology (DE)
- Centre National de la Recherche Scientifique (FR)
- Lawrence Berkeley National Laboratory (US)
- University of Patras (GR)
- Brock University (CA)
- Institut Néel (FR)
- Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona
- Universitat de Barcelona (ES)
- Université Grenoble Alpes (FR)
Publication Details
- Journal
- Chemistry - A European Journal
- Published
- 2024-11-13
- DOI
- https://doi.org/10.1002/chem.202403462
- Primary Topic
- Magnetism in coordination complexes
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- U.S. Department of Energy
- Ministerio de Economía y Competitividad
- Brock University
- Office of Science
- Natural Sciences and Engineering Research Council of Canada
- Basic Energy Sciences