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Issue 16, 2014
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Investigation of high Δε derivatives of the [closo-1-CB9H10] anion for liquid crystal display applications

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Abstract

Two series of polar compounds 3[n] and 4[n] with longitudinal dipole moments ranging from 10 to 17 D were synthesized and investigated as additives to two nematic hosts, ClEster and CinnCN. Compounds 3[n] do not exhibit liquid crystalline behavior and have limited compatibility with nematic hosts, but still are effective additives for increasing dielectric anisotropy, Δε, of liquid crystalline host materials. On the other hand, esters 4[n] typically exhibit nematic behavior and form stable solutions in ClEster up to 5 mol%. In this concentration range, the binary solutions exhibit a linear dependence of dielectric parameters and the extrapolated Δε values range from <18 (4[3]l, μ = 11.3 D) to 70 (4[3]c, μ = 14.1 D and 4[3]k, μ = 17.2 D). Analysis of the dielectric data with the Maier–Meier formalism using DFT-calculated α and μ parameters gave apparent order parameter values Sapp in a range of 0.51–0.68 and Kirkwood parameters g in a range 0.55–0.78 for esters 4[n].

Graphical abstract: Investigation of high Δε derivatives of the [closo-1-CB9H10]− anion for liquid crystal display applications

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Publication details

The article was received on 04 Feb 2014, accepted on 04 Mar 2014 and first published on 04 Mar 2014


Article type: Paper
DOI: 10.1039/C4TC00230J
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J. Mater. Chem. C, 2014,2, 2956-2964
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    Investigation of high Δε derivatives of the [closo-1-CB9H10] anion for liquid crystal display applications

    J. Pecyna, P. Kaszyński, B. Ringstrand and M. Bremer, J. Mater. Chem. C, 2014, 2, 2956
    DOI: 10.1039/C4TC00230J

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