Monoprotonated species of 2-aminomalonyl difluoride, [CHFNO][HF].

The monoprotonated species of 2-aminomalonyl difluoride, namely, 1,3-difluoro-1,3-dioxopropan-2-aminium dihydrogen trifluoride, [CHFNO][HF], was synthesized from sulfur tetrafluoride in anhydrous hydrogen fluoride (aHF) with [NH][CHNO] as the starting material. The solvent was removed and the salt was dissolved in aHF and crystallized. In the solid state, the three-dimensional network is built by medium-strong N-H...F hydrogen bonds and C...F contacts. This is the first structure determination of an aminoacyl difluoride and the second of an aminoacyl fluoride.