Low-spin to low-spin valence tautomeric transition in cobalt bis-dioxolenes

Mörtel M, Goodner SJ, Oschwald J, Scheurer A, Drewello T, Khusniyarov M (2024)

Publication Type: Journal article

Publication year: 2024


DOI: 10.1039/d3dt03935h


Cobalt dioxolenes are a well-known class of switchable coordination compounds showing intramolecular electron transfer, which is always accompanied by a spin state change at the cobalt center. Here, we present the first example of thermally switchable cobalt bis-dioxolenes where intramolecular electron transfer seems to take place, but the spin state change is suppressed. This leads to the detection of thermal transition between a common ls-CoIII(SQ˙)(Cat2−) and an extremely rare ls-CoII(SQ˙)2 electronic state (hs - high-spin, ls - low-spin, SQ˙ - benzosemiquinonate(1−) radical and Cat2− - catecholate(2−)). Parallel to the present work, a similar work but on cobalt mono-dioxolenes has just appeared (Chem. Eur. J., 2023, 29, e202300091), suggesting thermal transition between ls-CoIII(Cat2−) and ls-CoII(SQ˙) electronic states.

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Mörtel, M., Goodner, S.J., Oschwald, J., Scheurer, A., Drewello, T., & Khusniyarov, M. (2024). Low-spin to low-spin valence tautomeric transition in cobalt bis-dioxolenes. Dalton Transactions. https://doi.org/10.1039/d3dt03935h


Mörtel, Max, et al. "Low-spin to low-spin valence tautomeric transition in cobalt bis-dioxolenes." Dalton Transactions (2024).

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