Issue 2, 2024

Magnetic exchange, anisotropy and excitonic fluctuations in a [Ni II7] Anderson wheel

Abstract

The solvothermal reaction of Ni(ClO4)2·6H2O with hmpH and picH in a basic MeOH solution affords [Ni7(hmp)7.55(pic)4.45](ClO4)2·6MeOH (1·6MeOH) directly upon cooling the mother liquor. The metallic skeleton of 1 describes a [NiII7] centred hexagon, commonly referred to as an Anderson wheel. Magnetic measurements reveal ferromagnetic exchange between the central Ni ion and the ring Ni ions, and antiferromagnetic exchange between neighbouring ring Ni ions. They also confirm the presence of easy-plane anisotropy for the central Ni ion, and easy-axis anisotropy for the ring Ni ions, in agreement with DFT calculations and neutron scattering. For the analysis of the latter we apply an excitonic formalism using a Green's function response theory.

Graphical abstract: Magnetic exchange, anisotropy and excitonic fluctuations in a [NiII7] Anderson wheel

Supplementary files

Article information

Article type
Research Article
Submitted
08 11 2023
Accepted
23 11 2023
First published
23 11 2023
This article is Open Access
Creative Commons BY license

Inorg. Chem. Front., 2024,11, 515-525

Magnetic exchange, anisotropy and excitonic fluctuations in a [NiII7] Anderson wheel

E. H. Payne, L. R. B. Wilson, M. K. Singh, G. S. Nichol, J. R. Stewart, V. Garcia-Sakai, R. A. Ewings, H. Lane, J. Schnack, C. Stock and E. K. Brechin, Inorg. Chem. Front., 2024, 11, 515 DOI: 10.1039/D3QI02307A

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