Abstract
The i.r. spectra of cis, cis, trans, trans and cis, trans-1,4-dichloro-1,3-butadiene were recorded in cyclohexane solution in the region 600-40 cm −1. Raman spectra, including polarization measurements of the neat liquids were obtained. Some previously unobserved fundamentals, particularly in the low frequency region, were assigned, and a few revisions in the earlier interpretations were made. Force fields containing 21 parameters for the cis, cis and the trans, trans compounds were constructed by transferring force constants from cis- and trans-1-chloro-1,3-butadiene. By mixing the force constants from these monochlorobutadienes a 29 parameter force field was derived for the cis, trans compound. The calculated r.m.s. amplitudes of vibration and perpendicular amplitude correction coefficients are presented.
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