X-Ray Diffraction of Some Biphenylcyclohexanes (BCH's)

Abstract

X-ray diffraction measurements have been made on BCH5Cl, BCH5Br, BCH5CN, BCH52 and binary mixture of BCH5CN and BCH52, in the nematic phase. BCH5C1 and BCH5Br are thought to have a weak molecular correlation along the texture axis with repeat unit along that axis of ~ 1.1 molecular lengths. Whereas for BCH5CN the repeat unit along the texture axis is about 1.4 molecular lengths implying a strong molecular association. The d-spacings of the binary mixtures of the strongly polar BCH5CN and the nonpolar BCH52, in the nematic phase, vary roughly linearly between the d-spacing of BCH5CN and that of BCH52.