Ordered structure constructed from C₂-symmetric hexa-peri-hexabenzocoronene linked with oligo(dimethylsiloxane)

Abstract

The preparation of sub-5 nm ordered structures is very important to the development of today’s nanotechnology. Block molecules have the potential to form structures with significantly small characteristic dimensions. Herein...

Effect of Flexible Spacer and Alkyl Tail Length on the Liquid Crystalline Phase Behavior of Fullerene Block Molecules

“…Combining high shape anisotropy and large Flory-Huggins interaction parameter between the incompatible moieties, the liquid crystalline fullerene block molecules reported here form several different lamellar structures through microphase segregation. Among them, a novel two-dimensional superlattice structure SL 3 4 containing 3 hydrocarbon layers alternating with 4 layers of fullerene 2D crystals is obtained. The superlattice structure may offer great potential in fabricating high-efficient optoelectronic devices.…”

“…Moreover, block molecules 5-12, 6-12, and 7-12 do not show an extra high temperature phase like 5-10, 6-10, and 7-10. This is mainly due to the high ratio of the flexible moiety in 5-12, 6-12, and 7-12, which makes the SL 3 4 -LQ transition temperature higher than the isotropization temperature. The phase assignments of block molecules m-n are summarized in Figure 5.…”

Highly Ordered Supramolecular Materials of Phase‐Separated Block Molecules for Long‐Range Exciton Transport

“…[3] Recently, oligodimethylsiloxane (oDMS) side chains have been attached to various aromatic cores to create highly ordered structures at the nanoscale. [16][17][18][19][20][21][22] In one such example, domains of millimeter-sized aligned 2D crystalline sheets could be obtained by slow cooling from their melt. [16] For this purpose, oDMS blocks of discrete length are covalently linked to diphenylanthracene (DPA).…”

“…Although functionalization of "hard" crystalline molecular blocks with soft oDMS blocks has been used to form highly ordered aromatic nanofibers in an oDMS matrix, this approach has mainly been used for asymmetric, C 2 -or C 4 -symmetric systems where the nanostructure formed depends on the oDMS volume fraction. [19][20][21][22][23][24][25][26][27] However, C 3 -symmetric molecules such as CBT have an inherent preference to form nanofibers and are thus more suitable to combine with oDMS functionalization to achieve micrometer-sized domains of highly ordered nanofibers for energy transfer applications. [28] Here we report on the synthesis, assembly and molecular and photophysical characterization of C 3 -symmetric CBT functionalized with linear and branched discrete length oligodimethylsiloxane.…”

Charge transport in liquid crystal network of terthiophene-siloxane block molecules

“…Early examples are phase-segregated LCs, 16,17 while more recent examples are based on discrete length block co-oligomers with one block consisting of discrete oligodimethylsiloxane (oDMS). 18–23 These materials assemble into well-defined phase-segregated structures with sub-10 nm feature sizes. The discrete nature of both the siloxanes and the complementary block promotes phase separation.…”