Knowledge Bank

A complete assignment of vibrational fundamentals has been obtained for 1 H-trifluorocyclopropene-$d0$ and -$d1$. Low symmetry of the molecule has been an asset in this case. Based on normal coordinate calculations as well as spectra provisional assignments are given for 3,3-difluorocyclopropene-$d0$ nd -$d2$. Some generalizations concerning group frequencies in cyclopropenes will be offered.