Knowledge Bank

The infrared and Raman spectra of $CF2Cl-CF2Cl,CF2Br-CF2Br,CF2I-CF2I$, and $K6[CF2Co(CN)5-CF2Co(CN)5]$ are reported in the solid state. The 1, 2 halo-substituted species were recorded at liquid nitrogen temperature. The trans-form in each case appears to be the most stable from these studies. Band assignments have been made for fundamentals on the basis of $C2h$ symmetry. The elusive C-C stretching fundamental in these compounds appears from 702 to $635cm-1$. The paucity of theoretical data for the fluoroethanes in general is discussed.