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Issue 8, 2013
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Transition between triangular and square tiling patterns in liquid-crystalline honeycombs formed by tetrathiophene-based bolaamphiphiles

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Abstract

A series of 5,5′′′-diphenyl tetrathiophenes with polar glycerol groups at each end and two lateral flexible chains self-assemble into a series of liquid-crystalline honeycombs, formed by the π-conjugated rods which enclose polygonal prismatic cells filled by the lateral chains. With increasing chain length a discontinuous transition from triangular to square honeycombs takes place. At this transition a periodic honeycomb composed of a mixture of square and triangular cells in a ratio 1 : 2 was formed at low temperature, whereas at higher temperature a hexagonal columnar phase composed of triangular and randomly distributed rhombic cells, a new kind of cybotactic nematic phase, and also a cybotactic isotropic phase, both composed of square honeycomb fragments, represent the intermediate states. This provides an example of a dynamic self-assembled system where, depending on the molecular mobility, the transition between two periodic structures with different symmetry either leads to an increase of complexity, or to a chaotic regime with reduced order.

Graphical abstract: Transition between triangular and square tiling patterns in liquid-crystalline honeycombs formed by tetrathiophene-based bolaamphiphiles

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Publication details

The article was received on 09 Mar 2013, accepted on 07 Jun 2013 and first published on 18 Jun 2013


Article type: Edge Article
DOI: 10.1039/C3SC50664A
Citation: Chem. Sci., 2013,4, 3317-3331

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    Transition between triangular and square tiling patterns in liquid-crystalline honeycombs formed by tetrathiophene-based bolaamphiphiles

    X. Cheng, H. Gao, X. Tan, X. Yang, M. Prehm, H. Ebert and C. Tschierske, Chem. Sci., 2013, 4, 3317
    DOI: 10.1039/C3SC50664A

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