Synthesis and Anion Affinity of a Bidendate Sulfonium Fluorosilane Lewis Acid
摘要:
The cationic fluorosilane [1-Ant(2)FSi-2-Me2S-(C6H4)](+) (2(+)) readily complexes fluoride ions to afford the corresponding zwitterionic difluorosilicate complex 1-Ant(2)F(2)Si-2-Me2S-(C6H4) (2-F) with a binding constant in CHCl3, of 7 (+/-1) x 10(6) M-1. Structural and computational results indicate that the high fluorophilicity of 2(+) arises from both Coulombic and cooperative effects reflected by the formation of a Si-F-S bridge with a F-S distance of 2.741(3) angstrom.
Synthesis and Anion Affinity of a Bidendate Sulfonium Fluorosilane Lewis Acid
摘要:
The cationic fluorosilane [1-Ant(2)FSi-2-Me2S-(C6H4)](+) (2(+)) readily complexes fluoride ions to afford the corresponding zwitterionic difluorosilicate complex 1-Ant(2)F(2)Si-2-Me2S-(C6H4) (2-F) with a binding constant in CHCl3, of 7 (+/-1) x 10(6) M-1. Structural and computational results indicate that the high fluorophilicity of 2(+) arises from both Coulombic and cooperative effects reflected by the formation of a Si-F-S bridge with a F-S distance of 2.741(3) angstrom.