Magnetic exchange, anisotropy and excitonic fluctuations in a [Ni II7] Anderson wheel†
Emily H.
Payne, 
a
Lucinda R. B.
Wilson,
a
Mukesh K.
Singh,
a
Gary S.
Nichol,
a
V.
Garcia-Sakai,
b
Jürgen
Schnack,
*d
Euan K.
Brechin
*a
a
Lucinda R. B.
Wilson,
a
Mukesh K.
Singh,
a
Gary S.
Nichol,
a
V.
Garcia-Sakai,
b
Jürgen
Schnack,
*d
Euan K.
Brechin
*a
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](/az/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=D3QI02307A&imageInfo.ImageIdentifier.Year=2024)
- This article is part of the themed collection: Celebrating our 2024 Prizewinners
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