Tuning the Columnar Organization of Discotic Polycyclic Aromatic Hydrocarbons

Abstract

The control of the intracolumnar organization of disc‐shaped polycyclic aromatic hydrocarbons has essential influence on material’s properties including thermotropic behavior and charge carrier transport which are crucial for applications in organic electronics. The utilization of a broad toolbox of peripheral substitution allows well‐defined modification of the molecular interactions and packing within helical columnar stacks (see figure).

Hybrid Semiconducting Materials: New Perspectives for Molecular‐Scale Information Processing

“…Besides the crystalline form, acene-like structures can occur as discotic liquid crystals, which are currently considered as a new generation of organic semiconductors [120]. They are half way between crystalline and amorphous phases.…”

“…These molecules are comprised of flat, rigid aromatic cores substituted with aliphatic chains, which may strongly affect their structures. The most common discotics have large, conjugated cores, for example, porphyrins, phtalocyanides, triphenylenes, hexaazatriphenylenes, perylenes, macrocycles, and hexa-peri-hexabenzocoronenes (Figure 7.10) [120].…”

Controlling the crystalline three-dimensional order in bulk materials by single-wall carbon nanotubes

“…A viable strategy to overcome such drawbacks implies the use of liquid crystals. Notably, the fact that liquid crystalline behaviour evolves between isotropic and crystalline phases, facilitates the macroscopic control over the bulk materials and surfaces across all length scales [11][12][13] . Such advantages are, however, offset by elaborate synthetic protocols and the difficulties to attain liquid crystalline properties.…”

Synthesis and thermotropic behavior of side chain polysiloxane bearing triphenylene moiety

“…The samples were prepared by fiber extrusion to induce macroscopic alignment in the specimen and were placed for the measurement vertically towards the 2D detector. In the LC phase both compounds self-assemble in identical characteristic structures (Figure 7b, 7d) [39]. The columnar stacks are oriented along the fiber direction as evident from the small-angle equatorial reflections.…”