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Updated: Jan 25, 2026

A BW Reporter System for Studying Receptor-Ligand Interactions
Published on: January 7, 2019
Using Redox-Active π Bridging Ligand as a Control Switch of Intramolecular Magnetic Interactions
Xiaozhou Ma1,2, Elizaveta A Suturina3, Mathieu Rouzières1,2
1CNRS, CRPP, UMR 5031, Pessac F-33600 , France.
Abstract:
Intramolecular magnetic interactions in the dinuclear complexes [(tpy)Ni(tphz)Ni(tpy)] n+ ( n = 4, 3, and 2; tpy, terpyridine; tphz, tetrapyridophenazine) were tailored by changing the oxidation state of the pyrazine-based bridging ligand. While its neutral form mediates a weak antiferromagnetic (AF) coupling between the two S = 1 Ni(II), its reduced form, tphz•-, promotes a remarkably large ferromagnetic exchange of +214(5) K with Ni(II) spins. Reducing twice the bridging ligand affords weak Ni-Ni interactions, in marked contrast to the Co(II) analogue. Those experimental results, supported by a careful examination of the involved orbitals, provide a clear understanding of the factors which govern strength and sign of the magnetic exchange through an aromatic bridging ligand, a prerequisite for the rational design of strongly coupled molecular systems and high TC molecule-based magnets.
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