Columnar hexagonal mesophase

Fig. 14. Illustrating the molecular organization of a columnar hexagonal mesophase.

Note 4 The lyotropic equivalent of a columnar hexagonal mesophase is known as a hexagonal mesophase in it, columns of amphiphilic molecules are surrounded by the solvent, normally water, or an oil in an inverse hexagonal mesophase. 

In this section, crown ethers will be discussed which are equipped with one taper-shaped substituent (Fig. 10). Columnar hexagonal mesophases are the most commonly observed phases in this kind of molecule. 

Upon addition of NaOTf, columnar hexagonal mesophases could be induced. For 68, 0.4 equiv. of salt were needed while for 67, only 0.2 equiv. of NaOTf were needed for mesophase induction. Upon complexation, the complexed crown ether moieties and the anions self-assemble within a supramolecular tube and the taper-shaped side groups stack over each other in the periphery. X-Ray scattering... 

He and Cammidge prepared liquid crystal 113 (Scheme 59) with a central [27] crown-9 moiety, three attached triphenylene units carrying a total of 12 hexyloxy chains and exhibiting a columnar hexagonal mesophase [122]. 

Figure 24 Typical X-ray diffraction patterns of aligned samples of the nematic, smectic A, smectic C, and columnar hexagonal mesophases.

Fig. 23a, b. Schematic representation of the structural model proposed for the thermotropic mesophase of mixed-valent diruthenium pentacarhoxylates. a Two polymeric chains shifted hy half a dimer, b columnar hexagonal mesophase huilt up hy four polymeric chains... 

Molecular recognition has been claimed to induce self-assembly into supramolecular architectures displaying columnar hexagonal mesophases... 

Subsequently, related dimeric tetracarboxylates, but containing single and multiple metal-metal bonds, were prepared and found to be mesomorphic. The first examples of this type were the dirhodium(II) complexes ((94) R = C H2 +i) with a Rh—Rh single bond, which formed Coin mesophases between 100 °C and 200 °C, at which temperature they decomposed. The columnar hexagonal mesophases were structurally identical to those of the copper tetracarboxylates. ... 

Amar-Yuli, J. Adamcik, S. Blau, A. Aserin, R. Mezzenga, Controlled embedment and release of DNA from lipidic reverse columnar hexagonal mesophases. Soft Matter 7, 8162-8168 (2011)... 

Main-chain polyesters based on 2,4,7-trinitrofluorenylidene malonate are also effective electron acceptors able to stabilize the columnar hexagonal mesophase of 2,3,6,7,10,11 -hexakispentyloxy tripheny-... 

Figure 4. Schematic phase diagrams of members of the radial hexayne series 1,2, and 3 as electron donors with TNF as the electron acceptor [26] Cr crystalline, Nd nematic discotic, Col, columnar rectangular, and Col), columnar hexagonal mesophase (o intracolumnar ordered). Iso isotropic liquid (see footnote 1 in Sec. 3 commenting on the nomenclature of columnar mesophases).

Percec V, Tomazos D, Heck J, Blackwell H, Ungar G (1994) Self-assembly of tapta-shaped monoesters of oligo(ethylene oxide) with 3,4,5-tris(n-dodecan-l-yloxy)henzoie acid and of their polymethacrylates into tubular supramolecular architectures displaying a columnar hexagonal mesophase. J Chem Soc Perkin Trans 2(1) 31 14. doi 10.1039/P29940000031... 

Their corresponding polymethacrylates (8) were obtained by free radical polymerization. These taper-shaped monoesters of oligo(ethylene oxide) (EO) with 3,4,5-tris(/ -dodecyloxybenzyloxy)benzoic acid and their corresponding polymers self-assembled into a tubular supramolecular architecture displaying an enantiotropic columnar hexagonal mesophase. This interesting supramolecular architecture is mentioned in the next section. 

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