van Rees K, Hield EK, Carpentier A, Maron L, Sproules S, Love JB. Exploring the Redox Properties of Bench-Stable Uranyl(VI) Diamido-Dipyrrin Complexes.
Inorg Chem 2022;
61:3249-3255. [PMID:
35129967 PMCID:
PMC9007458 DOI:
10.1021/acs.inorgchem.1c03744]
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Abstract
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The
uranyl complexes UO2(OAc)(L) and UO2Cl(L) of the redox-active, acyclic diamido–dipyrrin
anion L– are reported
and their redox properties explored. Because of the inert nature of
the complexes toward hydrolysis and oxidation, synthesis of both the
ligands and complexes was conducted under ambient conditions. Voltammetric,
electron paramagnetic resonance spectroscopy, and density functional
theory studies show that one-electron chemical reduction by the reagent
CoCp2 leads to the formation of a dipyrrin radical for
both complexes [Cp2Co][UO2(OAc)(L•)] and [Cp2Co][UO2Cl(L•)].
Air-stable
uranyl complexes of diamido−dipyrrin ligands
undergo one-electron reduction to form highly air-sensitive ligand
radical complexes instead of uranyl(V) complexes seen for diimine
analogues.
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