Abstract
Raman spectra of p-de(tertiary-butyl)benzene (PDTBB) were investigated in solutions and in the crystalline state. Infrared spectra in vapour phase, solutions, KI pellet and the polarized i.r. spectra of its oriented crystalline films were recorded between 4000 and 200 cm −1. Assignments of the molecular vibrations are given. The internal vibrations of the benzene ring in the vapour phase and solutions can be treated according to D 2 h and those of the tert-butyl group according to C 3ν local symmetry. The polarized i.r. spectra are discussed on the basis of the oriented gas model. In crystalline state a decrease in the D 2 h ring and C 3ν substituent symmetry can be observed. A weak interaction of the neighbouring molecules is indicated in the case of the benzene ring and methyl group vibrations.
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