Raman spectra of gases. VIII. Ring puckering in diborane

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Abstract
The Raman spectra of gaseous 11B2H6, 10B2H6, and B2D6 have been recorded from 0–3000 cm−1. The ν = 0 → 2, ν = 1 → 3, and ν = 2 → 4 ring puckering transitions have been observed for the 11B2H6 isotopic species at 753.7, 776.1, and 795.6 cm−1, respectively. The ν = 0 → 2 ring puckering transitions of the 10B2H6 and B2D6 species have been observed at 756.6 and 531.0 cm−1, respectively. The least squares fit of these data yields the ring puckering potential function V(X) = 6.50 × 105X4 + 7.30 × 104X2. The intensity of the Δν = 2 ring puckering transitions is shown to be due to electrical anharmonicity rather than mechanical anharmonicity or Fermi resonance. The observed gerade fundamentals are found to agree reasonably well with those found earlier from Raman investigations of the liquids.

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