AN INFRARED AND RAMAN STUDY OF 1,1'-DISUBSTITUTED FERROCENE COMPOUNDS

The infrared (4000-55/cm) and Raman (3200-75/cm) spectra of 1,1'- dibromo-, 1,1'-diiodo-, and 1,1'-dichloroferrocene are reported. An attempt is made to give a complete vibrational assignment for all fundamental vibrations of these molecules. The results of these assignments are compared to those of 1,1'- dimethylferrocene and of monosubstituted benzenes. The assigned frequencies were tested by utilizing the inequality rule of Whiffen and Steele.