The oxidation state of the cobalt centres can be controlled by modification of the protonation state in [2 × 2] grid-like arrays based on ionisable bis(hydrazone) ligands, allowing conversion of the paramagnetic CoII4 into the diamagnetic CoIII4 grid.
![Graphical abstract: Protonic modulation of redox properties in ionisable [2 × 2] grid-like metalloarrays](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=B315352E&imageInfo.ImageIdentifier.Year=2004)
L. H. Uppadine, J. Gisselbrecht and J. Lehn, Chem. Commun., 2004, 718 DOI: 10.1039/B315352E
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