Solvatochromism and Redox Multi‐Switch in a Trinuclear Cobalt(II) Complex
Résumé
A trinuclear cobalt(II) complex incorporating the redox‐active hexahydroxytriphenylene (H6HHTP) ligand was prepared and isolated in two different redox states: [CoII3(sq‐sq‐sq)]3+ ( 1 ) and [CoII3(cat‐sq‐sq)]2+ ( 2 ) (sq = semiquinone; cat = catecholate), enabled by its remarkable solvatochromic behavior. The ligand field tuning of the Co(II) centers through the ancillary ligand Me 3 TPA (tris(6‐methyl‐2‐pyridylmethyl)amine) allowed accessing six reversible one‐electron processes instead of only three with the parent TPA ligand, therefore increasing the range of redox‐coupled magnetic and optical switching in this system. Upon reduction, the three redox processes are ligand‐centered and involve the three sq•−/cat2− couples of hexahydroxytriphenylene (HHTP), while we hypothesize that some of the oxidation processes may involve the Co(II) metallic species.
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