FAR-INFRARED SPECTRA OF RING COMPOUNDS .3. SPECTRUM STRUCTURE AND RING-PUCKERING POTENTIAL OF SILACYCLOBUTANE

The infrared spectra of gaseous silacyclobutane and silacyclobutane-1, 1-d2 have been recorded in the range 24-300 cm-1. Both molecules show the complicated vibrational fine structure expected from a double-minimum potential for the ring-puckering vibration. The absorption maxima of silacyclobutane were fitted to a potential of the form V = a(x 4-bx2), where x is the ring-puckering coordinate. The potential barrier is calculated as 4403 cm-1, and the dihedral angle of the puckered ring as 35.92. The spectrum of silacyclobutane-1,1-d2 can be interpreted with the same potential function but the quantitative agreement with observed levels above the barrier is less accurate. The discrepancy is ascribed to interaction between the ring-puckering mode and the SiD2 rocking vibration.

FAR-INFRARED SPECTRA OF RING COMPOUNDS .3. SPECTRUM STRUCTURE AND RING-PUCKERING POTENTIAL OF SILACYCLOBUTANE Academic Article