Columnar liquid-crystalline assemblies of X-shaped pyrene–oligothiophene conjugates: photoconductivities and mechanochromic functions

Abstract

The self-assembly of X-shaped pyrene–oligothiophene conjugated molecules results in the formation of columnar liquid-crystalline structures that exhibit hole carrier transport properties and shear-induced phase transition accompanied by the luminescent colour change.

Solid‐State Light Emission Controlled by Tuning the Hierarchical Superstructure of Self‐Assembled Luminogens

“…Finally, the K 2 phase is converted to the K 1 phase at room temperature, and the luminescence intensity is remarkably enhanced at λ max = 530 nm. The redshift in the emission spectrum for the transition from the K 2 phase to the K 1 phase can be explained by the increased interchromophoric interaction, which is evident by another redshift for the transition from the LC mesophase to the K 2 phase . The additional increase in luminescence intensity should be originated from the complete restriction of AT 3 EMIS rotational motion, together with the closer packing of the disc in the self‐assembled column …”

Molecular Mobility in Oriented and Unoriented Membranes Based on Poly[2-(Aziridin-1-yl)ethanol]

“…On the other hand, the applicability of these membranes depends on their ability of rapid and selective transfer of cations, as well as on their mechanical properties; both aspects are mainly determined by the polymer mobility and orientation. Therefore, it might be desirable to get further insight into the dynamics of large supramolecular building blocks of these materials, in order to improve their self-assembly and optimize their performances [ 14 , 15 , 16 ].…”

Board‐like Fused‐Thiophene Liquid Crystals and their Benzene Analogs: Facile Synthesis, Self‐Assembly, p‐Type Semiconductivity, and Photoluminescence

“…[6] Oligothiophene derivatives end-capped with alkyl chains, show liquid crystalline properties, [7][8][9][10][11][12][13][14][15][16][17][18][19][20] and prefer to self-organize into supramolecular ordered layered structures:t hey display two-dimensional charge transport mobility comparable to inorganic semiconductors of amorphous and polycrystalline silicon, and have been investigated as active materials in organic field-effect transistors (OFET). [21][22][23][24][25] Discoticl iquid crystals (DLCs) [26][27][28][29] that contain afused-thiophene unit [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] are also attractive candidates as novel organic semiconductors owing to their advantageous combination of the highly applicable and promising electronic properties of the thiophene moiety and the propensityo fD LCs to self-organize into ac olumnar mesophase for one-dimensional charget ransportp athways. [26] However,t he number of thiophene-containing DLCs is still limited compared with the numerousr od-like liquid crystalsi ncorporatin...…”