Mesogenic properties of single ring compounds: dipentyl derivatives of p-carboranes and bicyclo[2.2.2]octane
作者:Andrew G. Douglass、Birgit Both、Piotr Kaszynski
DOI:10.1039/a807596d
日期:——
The dipentyl derivatives of 10- and 12-vertex p-carboranes and bicyclo[2.2.2]octane have been prepared and studied in the pure state and in binary mixtures with a nematic host. Only 1,4-dipentylbicyclo[2.2.2]octane was found to exhibit a monotropic nematic transition. The extrapolated virtual nematic-isotropic transition temperatures provide the expected order of ring effectiveness in supporting the nematic mesophase: bicyclo[2.2.2]octane>12-vertex p-carborane >10-vertex p-carborane. The results for the single ring derivatives [1]b were compared with clearing temperatures for the two-ring mesogens [2]c.
10-和12-顶点对碳硼烷和双环[2.2.2]辛烷的五戊基衍生物已经制备完成,并在纯态和与双旋主体的二元混合物中进行了研究。只有1,4-二戊基双环[2.2.2]辛烷表现出单极双旋转变。外推的虚拟双旋-等旋转变温度提供了环在支持双旋介相中的预期环效顺序:双环[2.2.2]辛烷>12-顶点对碳硼烷>10-顶点对碳硼烷。将单环衍生物[1]b的结果与双环介质的澄清温度[2]c进行了比较。