The vibrational spectrum of ruthenocene

Abstract
The complex Raman and i.r. spectra of ruthenocene at ambient and liquid-nitrogen temperatures have been interpreted with the aid of solution and Raman single-crystal data to yield a complete assignment, including inactive modes. The polarisation property of the π(C–H) modes in ferrocene has been determined for the first time. Contrary to the accepted order, the i.r.-active ring ‘tilt’ mode of ruthenocene comes at lower frequency than the M–ring bond stretch.

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