Investigation of Mixtures of Cholesteryl Esters of Boron Analogues of Amino Acids with p-Azoxyanisole

Abstract

The phase diagram and helical pitch of two cholesteryl esters of the boron analogues of amino acids in mixtures with p-azoxyanisole (PAA) were investigated. These amino acid analogues, in pure form, do not exhibit mesomorphic phases. However, their mixtures with PAA show a monotropic cholesteric phase. The behavior of the cholesteric-isotropic transition indicates that these esters are potentially mesomorphic. Although the binary phase diagrams of the two compounds are similar, the cholesteric pitches are significantly different due to differences in polarity or hydrogen bonding of the amino group of one of the esters.