The search for new amphiphiles: synthesis of a modular, high-throughput library

• George C. Feast,
• Thomas Lepitre,
• Xavier Mulet,
• Charlotte E. Conn,
• Oliver E. Hutt,
• G. Paul Savage and
• Calum J. Drummond

Beilstein J. Org. Chem. 2014, 10, 1578–1588, doi:10.3762/bjoc.10.163

• boundary (confirmed by a dark image when viewed with crossed polarisers) indicating the presence of either a cubic or micellar phase. By contrast the lactose amphiphile 70 (Figure 7) shows a birefringent texture corresponding to a lamellar phase. Preliminary small-angle X-ray scattering data for these

• (Figure 7). A disaccharide, such as lactose, has a large volume; however, in this amphiphilic form, the volume of the head group is matched by the volume of the double hydrocarbon chains and therefore, in water, the compound assembles into a lamellar phase. Upon reducing the head group size to glucose, we

Unusual polymorphism in new bent-shaped liquid crystals based on biphenyl as a central molecular core

• Anna Kovářová,
• Svatopluk Světlík,
• Václav Kozmík,
• Jiří Svoboda,
• Vladimíra Novotná,
• Damian Pociecha,
• Ewa Gorecka and
• Natalia Podoliak

Beilstein J. Org. Chem. 2014, 10, 794–807, doi:10.3762/bjoc.10.75

• with change of the structural chirality is detected more often [39][40][41]. Bent-shaped molecules rarely form a lamellar phase with a triclinic symmetry C1 called general tilt smectics, SmCG [42][43][44][45]. The molecules in the SmCG phase are tilted in such a way that the polarization vector has its

Thermotropic and lyotropic behaviour of new liquid-crystalline materials with different hydrophilic groups: synthesis and mesomorphic properties

• Alexej Bubnov,
• Miroslav Kašpar,
• Věra Hamplová,
• Ute Dawin and
• Frank Giesselmann

Beilstein J. Org. Chem. 2013, 9, 425–436, doi:10.3762/bjoc.9.45

• phase was observed. The relationship between the molecular structure and mesomorphic properties of these new LCs with hydrophilic chains is discussed. Keywords: contact cell preparation; hydrophilic chain; lamellar phase; lyotropic liquid crystal; thermotropic liquid crystal; Introduction All

• -alkoxyphenyl β-D-glucopyranosides [5]. LC compounds in which a hydrophilic polyethyleneimine chain with hydroxy side-groups is attached to the azobenzene mesogenic core through the alkylene chain have showed a thermotropic SmA phase, lyotropic lamellar phase, and a lyotropic analogue of the tilted smectic C

• -up of the lyotropic area. The myelinic streaks can be taken as clear evidence for the existence of the lamellar phase. However, more detailed studies of the phase diagram are necessary (in progress now; will be presented elsewhere) in order to get more quantitative results on the lyotropic behaviour