e-space
Manchester Metropolitan University's Research Repository

Coming full circle: constructing a [Gd6] wheel dimer by dimer and the importance of spin topology

Hooper, TN and Langley, SK and Gómez-Coca, S and Lorusso, G and Ruiz, E and Murray, KS and Evangelisti, M and Brechin, EK (2017) Coming full circle: constructing a [Gd6] wheel dimer by dimer and the importance of spin topology. Dalton Transactions, 46 (31). pp. 10255-10263. ISSN 1477-9226

[img]
Preview

Available under License Creative Commons Attribution.

Download (2MB) | Preview

Abstract

© 2017 The Royal Society of Chemistry. The syntheses, structures, magnetic and thermodynamic properties of three related triethanolamine-based Gd III complexes are described. The smallest, a dimer ([Gd 2 ]), can be viewed as the subunit from which the two larger complexes, a linear tetramer ([Gd 2 ] 2 ) and a cyclic hexamer ([Gd 2 ] 3 ), are composed by further deprotonation of the triethanolamine ligand. In all cases, nearest neighbour magnetic ions are weakly correlated by antiferromagnetic isotropic exchange, whose strength does not change significantly from one complex to another; J ranging from -0.10 to -0.13 cm -1 . Therefore, rather than the strength of the coupling, it is the spin topology that is the dominant factor in determining the differences between the physical properties-specifically, the nuclearity and the transition from open (dimer and tetramer) to cyclic (hexamer) boundary conditions. Indeed the hexanuclear wheel reaches the continuum limit of classical Heisenberg spin chains. In terms of the magnetocaloric properties, the smaller the nuclearity, the larger the magnetic entropy and adiabatic temperature changes.

Impact and Reach

Statistics

Downloads
Activity Overview
6Downloads
6Hits

Additional statistics for this dataset are available via IRStats2.

Altmetric

Actions (login required)

Edit Item Edit Item