The FTIR spectra of ferrocene, ruthenocene, cyclopentadienyl manganese tricarbonyl (CPMT), cyclopentadienyl titanium trichloride (CPTT), and cyclopentadienyl iron dicarbonyl iodide (CPIDI) CCl4 solutions are presented at the first and second overtone region (Delta upsilon = 2,3). The gaseous ferrocene, ruthenocene, and CPMT spectra are also presented at the third overtone region (Delta upsilon = 4) recorded by intracavity photoacoustic spectroscopy. Assignments for the observed transitions are suggested for the liquid and reevaluated for the gas-phase spectra. The influence of the metal and other ligands attached to the metal on the vibrational behavior of the cyclopentadienyl ring is also discussed.