A Nanosized {NiII18} Cluster with a ‘Flying Saucer’ Topology Exhibiting Slow Relaxation of Magnetisation Phenomena at Both 15 K and 1.3 K

Athanasopoulou, Angeliki A.; Abbasi, Parisa; Alexandropoulos, Dimitris I.; Hayward, John J.; Beavers, Christine M.; Teat, Simon J.; Wernsdorfer, Wolfgang; Mayans, Júlia; Escuer, Albert; Pilkington, Melanie; Stamatatos, Theocharis C.

doi:10.1002/chem.202403462

Title: A Nanosized {Ni^II₁₈} Cluster with a ‘Flying Saucer’ Topology Exhibiting Slow Relaxation of Magnetisation Phenomena at Both 15 K and 1.3 K

Journal Article · 13 November 2024 · Chemistry - A European Journal

DOI: https://doi.org/10.1002/chem.202403462 · OSTI ID:2497765

^[1]; Abbasi, Parisa ^[1]; Alexandropoulos, Dimitris I. ^[2]; Hayward, John J. ^[1]; Beavers, Christine M. ^[3]; Teat, Simon J. ^[3]; Wernsdorfer, Wolfgang ^[4]; Mayans, Júlia ^[5]; Escuer, Albert ^[5]; Pilkington, Melanie ^[1];

^[2]

Brock University, ON (Canada)
Brock University, ON (Canada); University of Patras (Greece)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of Grenoble Alpes, Grenoble (France); Karlsruhe Inst. of Technology (KIT) (Germany)
Univ. of Barcelona (Spain)

A high-nuclearity {Ni₁₈} 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 (N₃^-) and peroxido (O₂^2-) 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 η³:η³:μ₆-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 {Ni₁₈} 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2497765

Journal Information:: Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Journal Issue: 4 Vol. 31; ISSN 0947-6539

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: A Nanosized {NiII18} Cluster with a ‘Flying Saucer’ Topology Exhibiting Slow Relaxation of Magnetisation Phenomena at Both 15 K and 1.3 K

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Title: A Nanosized {Ni^II₁₈} Cluster with a ‘Flying Saucer’ Topology Exhibiting Slow Relaxation of Magnetisation Phenomena at Both 15 K and 1.3 K