Viologen-Based Redox-Active Ionic Liquid Crystals Forming Columnar Phases

Abstract

Viologens possessing three alkoxy chains at each terminal self-organize into columnar liquid-crystalline phases through nanophase segregation and electrostatic interactions. These viologens are redox-active and susceptible to two consecutive electrochemical reductions.

Effect of counterion on the mesomorphic behavior and optical properties of columnar pyridinium ionic liquid crystals derived from 4-hydroxypyridine

“…Influence of counterion on the mesomorphic behavior and photophysical properties of columnar pyridinium ionic liquid crystals derived from 4-hydroxypyridine OC 12 …”

Supramolecular honeycomb and columnar assemblies formed by self-assembly of coil-rod-coil molecules with a conjugated rod segment

“…The WAXS experiments further demonstrate that the rectangular columnar structure consists of microphase-separated crystalline rod domains and the amorphous coil domains (Figure 3(b)). [25][26][27][28] It is observed that on heating, the hexagonal ordered structure transforms into a 2-D rectangular columnar structure, hence, this result suggests that the hexagonal structure of molecule 7 in the crystalline state is an intermediate structure between the lamellar and 2-D rectangular columnar structures. Furthermore, an interesting point to be noted is that the peak intensity associated with the (002) reflection appears to be the most intense (Figure 3(a)), implying that the fundamental structure is lamellar.…”

Ionic Liquid Crystals Based on Pyridinium Salts

“…Columnar phases could be obtained for liquid crystals bearing two 3,4,5-tris(alkoxy) benzyl units attached to the 4,4'-bipyridinium moiety [61]. The viologen product bearing six octyloxy chains shows a hexagonal columnar (Col h ) phase, while the analogues with longer alkoxy chains (12 or 16) show rectangular columnar (Col r ) phases.…”