Polar derivatives of [closo-1-CB9H10]- and [closo-1-CB11H12]- anions as high Δε additives to a nematic host: a comparison of the CH2CH2 and COO linking groups

被引：5

作者：

Jakubowski, Rafal ^{[1
]}

Pecyna, Jacek ^{[2
]}

Ali, Muhammad O. ^{[2
]}

Pietrzak, Anna ^{[2
,3
]}

Friedli, Andrienne C. ^{[2
]}

Kaszynski, Piotr ^{[1
,2
,4
]}

机构：

[1] Polish Acad Sci, Ctr Mol & Macromol Studies, PL-90363 Lodz, Poland

[2] Middle Tennessee State Univ, Dept Chem, Murfreesboro, TN 37130 USA

[3] Tech Univ Lodz, Dept Chem, X Ray Crystallog Lab, PL-90924 Lodz, Poland

[4] Univ Lodz, Fac Chem, PL-91403 Lodz, Poland

来源：

DALTON TRANSACTIONS | 2021年 / 50卷 / 10期

关键词：

LIQUID-CRYSTALS; CARBORANE; PRECURSORS;

D O I：

10.1039/d1dt00211b

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A series of liquid crystalline pyridinium and sulfonium derivatives of the [closo-1-CB9H10](-) and [closo-1-CB11H12](-) anions containing the CH2CH2 linking group was prepared and their molecular and crystal structures were determined by single crystal XRD methods. Thermal and dielectric properties of the series were evaluated in a weakly polar nematic host. The highest extrapolated dielectric anisotropy, Delta epsilon, was observed for pyridinium zwitterions (up to 56.0). The dielectric data were analyzed with the Maier-Meier formalism augmented with density functional theory calculations, and the results were compared to those obtained for the analogous ester derivatives (COO linking group). The effect of the linking group on thermal and electrooptical properties is discussed.

引用

页码：3671 / 3681

页数：11

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