Six bis(4-alkoxyphenyl)viologen bistosylate salts (n = 1, 6, 8, 12, 14, 16), prepared from their bischloride salt precursors by the metathesis reactions, were characterized for thermotropic liquid-crystalline (LC) properties using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) studies. The salts with short alkoxy groups did not exhibit thermotropic LC phases on melting, but those with long alkoxy groups exhibited thermotropic smectic phases above their melting transitions (T<sub>m</sub>s) (Figure 1) and retained the LC phases up to their decomposition temperatures as determined using the hot-stage POM. Additionally, they exhibited crystal-to crystal transitions in the first heating cycles prior to their T<sub>m</sub>s. All the salts had high thermal stability in the temperatures range of 303-311 degrees C as determined by thermogravimetric analysis (TGA). Their optical properties were also included using UV-Vis and luminescence spectrometry.

Thermotropic liquid-crystalline and light-emitting properties of bis(4-alkoxyphenyl) viologen bistosylate salts

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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