Replacement of a C–C fragment with an N+–B− fragment leads to pairs of isosteric non-polar/polar nematics with a difference in the calculated molecular dipole moment of about 12 D. Contrary to the expectations, the uniform increase of the dipole moment does not affect phase stability equally, and a strong dependence on the substituent structure is observed. For one of the polar derivatives (5b, µ = 20 D) a record high dielectric anisotropy (Δε = 113) was measured in dilute nematic solutions.
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Journal of Materials Chemistry
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