Triphenylene 2, 3-dicarboxylic imides as luminescent liquid crystals: Mesomorphism, optical and electronic properties

Synthesis and Self-Assembly of Liquid Crystalline Triphenylenedicarboxythioimides

“…Triphenylene carboximides exhibiting columnar mesophases have been recently reported by Feng and co-workers, in which they installed the imide moiety in one synthetic step from the corresponding triphenylene diester ( 8 ) (Scheme ) . In their approach, the triphenylene ( 8 ) was generated in one pot from a diaryl acetylene ( 7 ), , which was prepared via a four-step synthetic sequence from commercially available catechol …”

“…From here, a modified version of Feng’s approach was used to install the desired imide in one synthetic step by refluxing the diester triphenylene ( 8 ) with the desired amine and excess imidazole in o -dichlorobenzene. In Feng’s procedure for imide formation, a very large excess of imidazole was used and the work-up described was difficult, including a messy extraction and removal of excess o -dichlorobenzene via evaporation after column chromatraphy . We found the reaction still proceeded cleanly with a 95% reduction in the amount of imidazole used.…”

An overview of phosphorescent metallomesogens based on platinum and iridium

“…81 Complex 24 displayed a lamellar liquid crystal behaviour in the range of 50 o C170 o C. However, very weak emission (550 nm) was detected in solution for complex 24. Recently, 'the same group reported a series of dinuclear alkynylplatinum (II) metallofoldamers containing 2,6-bis(Ndodecylbenzimidazole-2'-yl)pyridine pincer ligand (25) which exhibited gelation/self-assembly behaviour via noncovalent Pt…Pt and -stacking interactions. 82 In this research, the effect of the chain lengths of the complexes on the gelation behaviour, conformations and morphologies have been investigated.…”

“…To date, numerous luminescent liquid crystal materials, including polymers, oligomers, small molecules, and metal complexes, have been reported (1202 publications from Scifinder). [20][21][22][23][24][25][26][27][28][29][30][31][32][33] However, most of the reported luminescent liquid crystals are fluorescent materials (singlet emitters) which utilise only singlet excitons leading to low emission efficiency. To address this issue, introducing liquid crystals into the concept of phosphorescence (triplet emitters) could combine mesogenic properties with high emission efficiency.…”

Amorphous Ag2S Micro-rods-Enhanced Fluorescence on Liquid Crystals: Cation-π Interaction-Triggered Aggregation-Induced Emission Effect

“…Instead of the normally observed quenching in “conventional” luminophores, the restriction of intramolecular motion (RIM) (Chi et al., 2012, Mao et al., 2019, Mei et al., 2015, Zhang et al., 2015b) in aggregation state would intensify their fluorescence, transforming the weakly luminescent chromo-gens into fierce luminophores. The non-traditional systems, AIE-gens, thus provided a possibility to solve the conflicts between fluorescence quenching caused by the aggregation and the requirement of self-organization for LCs, becoming promising candidates for the evolution of novel LE-LCs (Bui et al., 2016, Feng et al., 2017, Jiang et al., 2018, Kim et al., 2014, Lu et al., 2016, Park et al., 2014, Pathak et al., 2016, Tanabe et al., 2012, Yu et al., 2013).…”