Knowledge Bank

Raman spectra of the difluorocyclopropenyl cation, and its deuterated modification have been observed in solution in $SO2$ with $BF4-$ as the counterion. Infrared spectra of the solid salts with $BF4-$ and $SbF6-$ have been obtained with an ``open-face sandwich’’ technique, In which, for example, a thin layer of $BF3$ and a thinner layer of trifluorocyclopropene are deposited on a CsI window at liquid nitrogen temperature and then allowed to react by repeated cycling to higher and higher temperatures. An assignment of the fundamentals will be presented and compared with those of the monofluorocyclopropenyl cation.