Two series of isomeric pyridinium zwitterions 1 and 2 have significantly different dipole moments, 12 D and 17 D, respectively, despite having almost the same geometry and conformational space. Therefore, these compounds are of interest for fundamental structure-properties studies and as components for electrooptical materials. We have synthesized both series of compounds using standard synthetic methods developed in our group, and compared their liquid crystalline behavior, focusing on the effect of the molecular dipole moment on the mesophase stability. All derivatives were analyzed using NMR, differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Selected compounds were characterized using X-ray diffraction and electrooptical methods. The latter involved dielectric investigation of binary mixtures in a nematic host augmented with DFT computational results.

Effect of molecular dipole on phase behavior of pyridinium derivatives of [closo-1-CB11H12]-

254th National Meeting (2017)

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