Self-assembled discotic liquid crystals formed by hydrogen bonding of alkoxystilbazoles

Recent NMR Studies of Thermotropic Liquid Crystals

“…Supramolecular LCs using hydrogen bonds based on phloroglucinol (trihydroxybenzene; PG) as a donor have been synthesized [256]. The hydrogen-bonded compound of PG with three stilbazoles, [trans-4-Butoxy-4 0 -stilbazole/PG] 3:1 (3), was first reported by Lee et al based on POM and X-ray diffraction studies to give a monotropic N Col phase between 90 and 124°C [257]. These authors showed that the three-armed systems formed by simple hydrogen bonding can form discotic columnar phases, N Col or hexagonal D h for longer alkyl chains, through self-assembly.…”

Fabrication of conjugated polymeric nanochannels from star-shaped supramolecular liquid crystals containing two different photoreactive groups

“…Spectral features were in accordance with our previous studies using simple hydrogen bonding between phenol and pyridine moieties. [36][37][38][39][40] The phase transition behaviours of supramolecular LC were studied by the differential scanning calorimetry (DSC) and polarized optical microscopy (POM) measurements. The supramolecular LC exhibited a monotropic transition detected at 69.5°C on cooling (Figure 4(a)).…”

“…[34,35] We previously found that star-shaped supramolecular liquid crystals formed by simple hydrogen bonding exhibit a variety of discotic mesophases, and the single hydrogen bonding between phenol and pyridine moieties can be a simple and effective method for constructing elaborate columnar structures. [36][37][38] Recently, we reported a new route to fabricate conjugated polymeric columns with a twodimensional hexagonal symmetry using star-shaped supramolecular liquid crystals as photoreactive monomers. [39,40] This intriguing structure could be constructed via topochemical polymerisation of the supramolecular monomer along the column axis in the LC state.…”

Studies of an Intermolecular Hydrogen-Bonded Complex of Butyloxy Benzoic Acid and Dipyridyl Ethylene

“…Hydrogen bond interactions are stronger than van der Waals interactions [2]; they can bring about a selfassembly of supramolecular aggregates [3,4]. In recent years, much attention has been paid to the development of several supramolecular mesogenic materials via molecular self assembly through hydrogen bonding [5][6][7][8][9][10][11][12]. Earlier, Bradfield et al [13] and Gray and Jones [14] found that hydrogen bonding in 4-substituted benzoic acids can induce the formation of liquid crystalline phases.…”