Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 19, Pages 6846-6849Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja502410e
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Funding
- National Natural Science Foundation of China [21374086]
- NSF-EPSRC PIRE program RENEW [EP/K034308/1]
- DFG [FG 1145, TS 39/21-2]
- Leverhulme Foundation [RPG-2012-804]
- Office Of Internatl Science &Engineering
- Office Of The Director [1243313] Funding Source: National Science Foundation
- Engineering and Physical Sciences Research Council [EP/K034308/1] Funding Source: researchfish
- EPSRC [EP/K034308/1] Funding Source: UKRI
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A series of T-shaped polyphilic molecules composed of a rigid linear biphenyl core with a polar glycerol group at each end and one swallow-tail semi-perfluorinated lateral chain were synthesized and their thermotropic liquid crystalline (LC) phases were investigated by X-ray diffraction, calorimetry, and microscopy. The compounds have a long alkyl spacer between the aromatic core and the fluorinated CnF2n+1 ends, where n = 4, 6, 8, and 10. Upon melting, all compounds start with lamellar LC phases, followed on heating by a rectangular columnar ribbon phase with c2mm symmetry. Unusually, a ribbon is a flat bundle of molecular cores highly aligned parallel to the ribbon axis. On further heating, for n = 8 and 10, this phase is succeeded by a bicontinuous cubic phase with Ia (3) over bard symmetry. This is a new variant of the gyroid phase, with axially oriented rod-like molecular cores forming the skeleton of the two infinite networks and junctions separated by exactly two molecular lengths. In this tricontinuous core-shell structure (aromatic-aliphatic-perfluoroalkyl), the polar glycerol domains of appreciable size, contained within the skeleton, can be considered as micellar.
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