NDLI: Polar derivatives of the [closo-1-CB9H10]− cluster as positive Δε additives to nematic hosts

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Polar derivatives of the [closo-1-CB₉H₁₀]⁻ cluster as positive Δε additives to nematic hosts

Content Provider	Royal Society of Chemistry (RSC)
Author	Januszko, Adam Ringstrand, Bryan Kaszynski, Piotr Young, Victor G.
Copyright Year	2009
Abstract	Polar (µ ≈ 16 D) and UV transparent >250 nm quinuclidinium (1) and sulfonium (2) zwitterionic derivatives of the [closo-1-CB9H10]− anion were synthesized and studied as additives to nematic hosts. The molecular and crystal structures for 1 [C19H44B9N triclinic, P-1, a = 9.766(2) Å, b = 10.481(3) Å, c = 12.098(3) Å, α = 93.804(9)°, β = 90.249(10)°, γ =102.587(10)°, Z = 2] were determined by X-ray crystallography and compared with the results of HF/6-31G(d) calculations. Low concentration solutions (<10 mol%) of 1 and 2 in ClEsterhost (Δε = −0.59) were investigated using thermal and dielectric methods. The results for 1 and 2 showed virtual [TNI] values of 139 °C and 92 °C, and Δε extrapolated to infinite dilution of 70 ± 1 and 61 ± 2, respectively. Dielectric results were analyzed using the Maier-Meier relationship and calculated molecular parameters. The apparent order parameter Sapp was found to be 0.63 and 0.50 for 1 and 2, respectively, which is smaller than that for the pure host (S = 0.66). Analysis of the Kirkwood factors g obtained for each concentration gave an association constant K of 63 ± 2 and 37 ± 1 (model 1) for the assumed dimerization of molecules (2M ⇌ M2) of 1 and 2, respectively, in solutions of ClEster.
Starting Page	9204
Ending Page	9212
Page Count	9
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	19
Issue Number	48
Journal	Journal of Materials Chemistry
DOI	10.1039/b913701g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Sapp Sulfonium Ion Liquid crystal Triclinic crystal system X-ray crystallography Hydrogen fluoride Dielectric Indonesian National Armed Forces Phase transition Kirkwood Mountain Resort Binding constant
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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