Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 28, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202200893
Keywords
aluminum complex; biradical; diselenolene; electronic structure; radical; X-ray diffraction
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Funding
- Swiss National Science Foundation
- Ecole Polytechnique Federale de Lausanne (EPFL)
- Ecole Polytechnique Federale de Lausanne
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This study describes a biselenolene ligand with unique electronic properties, exhibiting diamagnetic nature and redox activity, allowing for the isolation of stable radicals and unconventional coordination chemistry.
Dichalcogenolenes are archetypal redox non-innocent ligands with numerous applications. Herein, a diselenolene ligand with fundamentally different electronic properties is described. A mesoionic diselenolene was prepared by selenation of a C2-protected imidazolium salt. This ligand is diamagnetic, which is in contrast to the paramagnetic nature of standard dichalcogenolene monoanions. The new ligand is also redox-active, as demonstrated by isolation of a stable diselenolene radical dianion. The unique electronic properties of the new ligand give rise to unusual coordination chemistry. Thus, preparation of a hexacoordinate aluminum tris(diselenolene) complex and a Lewis acidic aluminate complex with two ligand-centered unpaired electrons was achieved.
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