Six bis(4-alkoxyphenyl)viologen bis(triflimide) salts (alkoxy chain length n = 1, 6, 8, 16, 18, 20), 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 also exhibited smectic-isotropic transitions (T<sub>i</sub>s) as determined using the hot-stage POM. All the salts had high thermal stability in the temperatures range of ca. 330-370 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 bis(triflimide) salts

Macromolecular Chemistry: The Second Century

[Author Benefits](https://scimeetings.acs.org/?utm_source=pubs_content_marketing&utm_medium=website&utm_campaign=0320_MCF_NPI_Launch_Spring_Homepage&ref=pubs_content_marketing)

[How to use SciMeetings](https://storage.googleapis.com/dl.morressier.com/acs/SciMeetings-ACSSpring2020-HowToGuide_M3020-Final.pdf)

[Frequently Asked Questions](https://storage.googleapis.com/dl.morressier.com/acs/SciMtng_ACSNMSp2020_FAQ_M3120_Final.pdf)

ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.