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Single-chain magnet behavior in a 2p–3d–4f spin array with a nitronyl nitroxide biradical

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Abstract

Three biradical-bridged heterometallic chains, [LnCu2(hfac)7(bisNITPhPy)]n (LnIII = Gd, 1; Tb, 2; Ho, 3), were synthesized by means of a nitronyl nitroxide biradical bisNITPhPy ([5-(4-pyridyl)-1,3-bis(1′-oxyl-3′-oxide-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl)]benzene; hfac = hexafluoroacetylacetonate). In these structures, the bisNITPhPy biradical serves as a pentadentate ligand to hold one LnIII ion through two neighboring aminoxyl (NO) moieties in chelating mode, while other two NO groups are coordinated to Cu(hfac)2 units, leading to a 1D Cu–Ln-birad chain. An additional terminal Cu(hfac)2 unit linked to a pyridine-N atom is found at the periphery. The magnetic susceptibility data of compound Gd have been analyzed with a closed ring model comprising three [Cu–Rad–Gd–Rad] units, which indicates ferromagnetic Gd(III)–nitroxide and Cu(II)–axial nitroxide interactions. The Tb derivative was found to behave as a single chain magnet with an energy barrier for magnetization reversal of 26 K.

Graphical abstract: Single-chain magnet behavior in a 2p–3d–4f spin array with a nitronyl nitroxide biradical

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Supplementary files

Article information


Submitted
22 Jan 2020
Accepted
19 Mar 2020
First published
20 Mar 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

Single-chain magnet behavior in a 2p–3d–4f spin array with a nitronyl nitroxide biradical

J. Sun, J. Xie, L. Li and J. Sutter, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QI00098A

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