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Proton NMR Studies and Lineshape Simulations of the Mesophases of Terephthalylidene -Bis -4 -n-propylaniline (TBPRA) — Evidence for Conformational Changes

Abstract From comparison of simulated and experimental spectra in the nematic, smectic-A, and smectic-A phases of TBPrA it can be concluded that there are conformational changes of the molecule giving obviously rise to a continuous variation of the direction of the long molecular axis with respect to a frame of reference connected with a conformation of the molecule that was derived from the crystal conformation of TBBA.