Abstract
The proton magnetic resonance spectra for (CH 3) 4C and (CH 3)(CD 3) 3C and the deuteron magnetic resonance spectra for (CD 3) 4C and (CH 3)(CD 3) 3C have been obtained in nematic liquid-crystal mixtures over the temperature range 30 to 70°C. Each solution contained approximately 26 mole% solute, 55.5 mole% butyl- p( p-ethoxyphenoxycarbonyl)phenyl carbonate (BEPC), and 18.5 mole% p-( p-ethoxyphenylazo)-phenyl undecylenate (EPU). Proton-proton dipolar splittings were observed for (CH 3)(CD 3) 3C but not for (CH 3) 4C, while both (CD 3) 4C and (CH 3)(CD 3) 3C showed quadrupolar splittings. Analyses are discussed in which the dipole-dipole and the quadrupolar splittings are assumed to have additive contributions from both molecular alignment and orientation-dependent moleular distortion. The dipolar splittings indicate that the pseudo-C 3 axis of (CH 3)(CD 3) 3C is aligned with the favored direction of the nematic phase.
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