Far-Infrared, Combination Band, and Raman Spectra of the Ring-Puckering Vibration of 1,4-Disilacyclohexa-2,5-diene
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The far-infrared spectrum of 1,4-disilacyclohexa-2,5-diene shows a series of four closely spaced bands originating at 70.5 cm-1 resulting from the ring-puckering vibration. Four mid-infrared bands near 2214 cm-1 result from combinations of the puckering with the Raman active B2g SiH2 antisymmetric stretch at 2143.2 cm-1, and seven difference bands near 2083 cm-1 result from combinations with the Raman active Ag SiH2 symmetric stretch at 2154.0 cm-1. The ring-puckering transitions result from a single-minimum potential energy function, V(cm-1) = 1.23 × 104x2 + 2.40 × 104x,4 where x is the puckering coordinate. The molecule is planar and less rigid than 1,4-cyclohexadiene, thus apparently showing no unusual interactions between the silicon atoms and the C=C π systems.
author list (cited authors)
del Rosario, A., Bitschenauer, R., Dakkouri, M., Haller, K., & Laane, J.