17.11.2025 The Methyl Bismuth Dication
The methyl bismuth dication, [BiMe(thf)5]2+, has been synthesized and fully characterized. Surprizingly, a pentagonal pyramidal coordination geometry is realized and thermodynamically favored. The substitution of THF ligands for bidentate nitrogen ligands releases Lewis superacidic properties. The reasons for the unusual coordination chemistry and reactivity of the dicationic species are analyzed and discussed. This work has just been accepted for publication in Angew. Chem. Int. Ed. and has received "hot paper" status - congratulations to the team!