A sandwich complex of trimesitylborane Mes 3 B: synthesis, characterization and anion binding properties of Mes2B[(η6-Mes)FeCp]+
- Additional Document Info
- View All
As part of our continuing interest in the chemistry of Lewis acidic organoboron compounds as anion receptors, we have synthesized the hexafluorophosphate salt of the cationic borane Mes2B[(η 6-Mes)FeCp]+ (+) by reaction of [(η6-naphthalene)FeCp][PF6] with Mes3B. This compound, which undergoes two quasi-reversible reductions at E 1/2 = -1.56 V and -2.40 V, reacts with both fluoride and cyanide anions in THF or MeOH to afford the corresponding zwitterionic fluoro- (1-F) and cyano-borate (1-CN) species, respectively. Spectrophotometric titrations carried out in THF indicate that the fluoride and cyanide binding constants of + are much larger than those of Mes3B. This difference points to the favorable inductive and coulombic effects imparted by the cationic [CpFe]+ moiety on the Lewis acidity of the boron center. © 2011 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
author list (cited authors)
Cao, D., Zhao, H., & Gabbaï, F. P.