Metal sandwich compounds such as ferrocene (FeCp<sub>2</sub>) and ruthenocene (RuCp<sub>2</sub>) exhibit the six skeletal modes shown in Fig. 1. Among them, the ring tilt (<i>v</i><sub>5</sub>), the metal–ring stretch (<i>v</i><sub>3</sub>), and the ring–metal–ring bending (<i>v</i><sub>6</sub>) are infrared active under <i>D</i><sub>5h</sub> (or <i>D</i><sub>5d</sub>) symmetry.

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