The Raman spectra of various isotopic derivatives of cyclopentene have been studied from 20 U, 293 K as functions of temperature and isotopic substitution. In the solid phase I, two p k s between 130 and 180 cm-l, assigned to the ting-puckering mode, allow the ring-puckering potential function to be determined in the onedimensional approximation. Compared with the gas phase, it shows only a slight increase in the banier height, smaller for monohydrogenated -3hl cyclopentene (Q3H) than for the perhydrogenated cyclopentene (CyHs), and a simullaneous decrease in the puckering angle value, more pronounced for Q3E than for QHS These trends could explain the appearance of a new solid phase I', characterized by a planar contormalion of the cyclopentene ring, in the mullideuterated cyclopsntene derivatives. In the solid I and plastic phases, the u(CH) stretching spectra of monohydrogenated -3h1 (Cy3H) and 4 h l (Cy4H) cyclopentenes show two distinct u(CH) bands assigned U, the CH bond in the axial and equatorial positions. The c o a h n c e of these two bands in the liquid smte indicates an exchange rate behveen the two conformen of about 5 x 10'' s-l at 295 K.
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