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Issue 4, 2015
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Modulation of phase behaviors and charge carrier mobilities by linkage length in discotic liquid crystal dimers

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Abstract

A clear structure–property relationship was revealed in a series of triphenylene-based dimers, which contained two triphenylene nuclei each bearing five β-OC4H9 substituents and are linked through a flexible O(CH2)nO polymethylene chain (n = 6–12). Dimers with the linkage close to twice the length of the free side chains (n = 8, 9) exhibited a single Colhp phase, while others with the linkage shorter (n = 6, 7) or longer (n = 10, 11, 12) showed multiphase behaviors with a transition from the Colhp phase to Colh phase; hole mobilities of Colhp phases reached 1.4 × 10−2 cm2 V−1 s−1 in the dimer for which the linkage is exactly twice the length of the free side chains (n = 8), and decreased regularly both with linkage length becoming shorter or longer. This modulation of phase behaviors and charge carrier mobilities was demonstrated to be generated by various steric perturbations introduced by linkages with different lengths, which result in different degrees of lateral fluctuations of discotic moieties in the columns.

Graphical abstract: Modulation of phase behaviors and charge carrier mobilities by linkage length in discotic liquid crystal dimers

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Publication details

The article was received on 28 Oct 2014, accepted on 26 Nov 2014 and first published on 27 Nov 2014


Article type: Paper
DOI: 10.1039/C4SM02369B
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Citation: Soft Matter, 2015,11, 712-718
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    Modulation of phase behaviors and charge carrier mobilities by linkage length in discotic liquid crystal dimers

    Y. Wang, C. Zhang, H. Wu, A. Zhang, J. Wang, S. Zhang and J. Pu, Soft Matter, 2015, 11, 712
    DOI: 10.1039/C4SM02369B

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