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Synthesis and Structure of Mono-, Di-, and Trinuclear Fluorotriarylbismuthonium Cations
[Image: see text] A series of cationic fluorotriarylbismuthonium salts bearing differently substituted aryl groups (Ar = 9,9-Me(2)-9H-xanthene, Ph, Mes, and 3,5-tBu-C(6)H(3)) have been synthesized and characterized. While the presence of simple phenyl substituents around the Bi center results in a p...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9490813/ https://www.ncbi.nlm.nih.gov/pubmed/36156903 http://dx.doi.org/10.1021/acs.organomet.2c00135 |
Sumario: | [Image: see text] A series of cationic fluorotriarylbismuthonium salts bearing differently substituted aryl groups (Ar = 9,9-Me(2)-9H-xanthene, Ph, Mes, and 3,5-tBu-C(6)H(3)) have been synthesized and characterized. While the presence of simple phenyl substituents around the Bi center results in a polymeric structure with three Bi centers in the repeating monomer, substituents at the ortho- and meta-positions lead to cationic mono- and dinuclear fluorobismuthonium complexes, respectively. Preparation of all compounds is accomplished by fluoride abstraction from the parent triaryl Bi(V) difluorides using NaBAr(F) (BAr(F)(–) = B[C(6)H(3)-3,5-(CF(3))(2)](4)(–)). Structural parameters were obtained via single crystal X-ray diffraction (XRD), and their behavior in solution was studied by NMR spectroscopy. Trinuclear and binuclear complexes are held together through one bridging fluoride (μ-F) between two Bi(V) centers. In contrast, the presence of Me groups in both ortho-positions of the aryl ring provides the adequate steric encumbrance to isolate a unique mononuclear nonstabilized fluorotriarylbismuthonium cation. This compound features a distorted tetrahedral geometry and is remarkably stable at room temperature both in solution (toluene, benzene and THF) and in the solid state. |
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