RING-PUCKERING COMBINATION BAND SPECTRA OF 1,3-DISILACYCLOBUTANE IN SIH2 STRETCHING REGION
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Three sets of sum bands and two sets of difference bands arising from the combination of the ring-puckering vibration with SiH2 stretching modes have been observed between 2060 and 2260 cm-1 in the infrared spectrum of 1,3-disilacyclobutane. An unusual feature of the spectrum is that there is little correlation in intensity between corresponding sum and difference bands. An additional sum band and a difference band were also observed in the Raman spectrum. The spectra confirm the low-frequency ring-puckering assignment and verify the position of the weak 2-3 transition near 31 cm-1. The puckering levels in the excited states of the SiH2 stretching modes are virtually unshifted relative to the ground state demonstrating that negligible coupling exists between these vibrations. In addition, sum and combination bands have been observed off an SiD2 stretching mode for 1,3-disilacyclobutane-1,1,3,3-d4. 1978.
JOURNAL OF MOLECULAR SPECTROSCOPY
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IRWIN, R. M., & LAANE, J.
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