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Enhancing easy-plane anisotropy in bespoke Ni(II) quantum magnets

Manson, Jamie L.; Manson, Zachary E.; Sargent, Ashley; Villa, Danielle Y.; Etten, Nicole L.; Blackmore, William J.A.; Curley, Samuel P.M.; Williams, Robert C.; Brambleby, Jamie; Goddard, Paul A.; Ozarowski, Andrew; Wilson, Murray N.; Huddart, Benjamin M.; Lancaster, Tom; Johnson, Roger D.; Blundell, Stephen J.; Bendix, Jesper; Wheeler, Kraig A.; Lapidus, Saul H.; Xiao, Fan; Birnbaum, Serena; Singleton, John

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Authors

Jamie L. Manson

Zachary E. Manson

Ashley Sargent

Danielle Y. Villa

Nicole L. Etten

William J.A. Blackmore

Samuel P.M. Curley

Robert C. Williams

Jamie Brambleby

Paul A. Goddard

Andrew Ozarowski

Murray N. Wilson

Roger D. Johnson

Stephen J. Blundell

Jesper Bendix

Kraig A. Wheeler

Saul H. Lapidus

Fan Xiao

Serena Birnbaum

John Singleton



Abstract

We examine the crystal structures and magnetic properties of several S = 1 Ni(II) coordination compounds, molecules and polymers, that include the bridging ligands HF2-, AF62- (A = Ti, Zr) and pyrazine or non-bridging ligands F-, SiF62-, glycine, H2O, 1-vinylimidazole, 4-methylpyrazole and 3-hydroxypyridine. Pseudo-octahedral NiN4F2, NiN4O2 or NiN4OF cores consist of equatorial Ni-N bonds that are equal to or slightly longer than the axial Ni-Lax bonds. By design, the zero-field splitting (D) is large in these systems and, in the presence of substantial exchange interactions (J), can be difficult to discriminate from magnetometry measurements on powder samples. Thus, we relied on pulsed-field magnetization in those cases and employed electron-spin resonance (ESR) to confirm D when J << D. The anisotropy of each compound was found to be easy-plane (D > 0) and range from ≈ 8-25 K. This work reveals a linear correlation between the ratio d(Ni-Lax)/d(Ni-Neq) and D although the ligand spectrochemical properties may also be important. We assert that this relationship allows us to predict the type of magnetocrystalline anisotropy in tailored Ni(II) quantum magnets.

Citation

Manson, J. L., Manson, Z. E., Sargent, A., Villa, D. Y., Etten, N. L., Blackmore, W. J., …Singleton, J. (2020). Enhancing easy-plane anisotropy in bespoke Ni(II) quantum magnets. Polyhedron, 180, Article 114379. https://doi.org/10.1016/j.poly.2020.114379

Journal Article Type Article
Acceptance Date Jan 17, 2020
Online Publication Date Jan 22, 2020
Publication Date Apr 1, 2020
Deposit Date Jan 24, 2020
Publicly Available Date Mar 29, 2024
Journal Polyhedron
Print ISSN 0277-5387
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 180
Article Number 114379
DOI https://doi.org/10.1016/j.poly.2020.114379

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