Zwitterionic pyridinium derivatives of [<i>closo</i>-1-CB<sub>9</sub>H<sub>10</sub>]<sup>−</sup>and [<i>closo</i>-1-CB<sub>11</sub>H<sub>12</sub>]<sup>−</sup>as high Δ<i>ε</i>additives to a nematic host
Journal of materials chemistry. C