Synthesis and liquid crystalline properties of poly(1‐alkyne)s carrying triphenylene discogens

Abstract

Triphenylene-containing 1-decynes with different alkyl chain lengths and their polymers are synthesized and the effects of the structural variables on their mesomorphic properties are investigated. The monomers [HCϵC(CH 2 ) 8 CO 2 C 18 H 6 (OC m H 2mþ1 ) 5 ; m ¼ 4-9] are prepared by consecutive etherization, coupling, and esterification reactions. The monomers form columnar phases at room temperature. The polymerizations of the monomers are effected by [Rh(nbd)Cl] 2 , producing soluble polymers in high yields (up to 84%). The structures and properties of the polymers are characterized and evaluated by IR, NMR, TGA, DSC, POM, and XRD analyses. All the polymers are thermally stable, losing little of their weights when heated to 300 8C. The isotropization temperature of the polymers increases initially with the length of alkyl chain but decreases on further extension. Although the polymers with shorter and longer alkyl chain lengths adopt a homogeneous hexagonal columnar structure, those with intermediate ones form mesophases with mixed structures.

DFT Study on the Effect of Different Peripheral Chains on Charge Transport Properties of Triphenylene Derivatives

“…12 Our research team has synthesised several monomers of polyacetylene containing triphenylene. 15 In this paper, we have used semi-classical Marcus theory to study the monomers at the quantum-chemical level, and mainly discussed the effect of different peripheral chains on charge transport properties of triphenylene. We hope that our theoretical results will be helpful to experimental study.…”

Synthesis and thermotropic behavior of side chain polysiloxane bearing triphenylene moiety

“…The attachment of the side triphenylene groups to the polysiloxane was performed in typical hydrosilylation conditions (Figure 1) in toluene using Karstedt's catalyst at 60-80°C. The conversion of 90% after 24 hrs (as proved by disappearance of Si-H signal at 2100 cm -1 in FTIR) was rather typical for hydrosilylation of alkenes, bearing bulky substituents, by polysiloxanes [26,27]. The reaction continued for further 48 hrs led to final anchoring of 94% of unsaturated triphenylene ester.…”

“…Data analysis was performed using the Datasqueeze 3.0.0 software. (Figure 1) Functionalized triphenylenes (3) and (4) were prepared similar to the reported method [26]. 40 g (0.144 mol) of 1,2-dihexyloxybenzene (1) and 35.75 g (0.288 mol) of guiacol (2) were dissolved in 350 mL.…”

Synthesis and mesomorphism of diacetylene-bridged triphenylene discotic liquid crystal dimers

“…They have been applied as one-dimensional conductors [14] , photoconductors [15] , and light-emitting diodes [16] . In recent years, triphenylene DLC dimers, oligomers and polymers have attracted increasing attention [17][18][19][20][21][22][23][24] . The dynamics of discogens, such as rotation around the column axes, fluctuation in the column, and slippage out of column, has been partially inhibited by connecting two triphenylene mesogens via a spacer.…”