Stability of a columnar liquid crystalline phase in isomeric derivatives of the 1,4-dihydrobenzo[e][1,2,4]triazin-4-yl: Conformational effects in the core

摘要

Fluid phase behaviour of three isomeric 1,3,6-trisubstituted benzo[e][12,4]triazin-4-ylderivatives with the half disc molecular architecture was examined in the pure form and in binary mixtures. Results indicate that the position of substitution with two wedge-shaped 3,4,5-tridodecyloxyphenyl groups and one Ph group has dramatic impact on the Col(h) phase stability, which ranges from 73 degrees C to presumably below -60 degrees C. Analysis of electronic and steric factors suggests that the intermolecular interactions of the wedge-shaped substituents are dominant and through their conformational behaviour they affect packing of the column's core and hence phase stability. (C) 2019 Elsevier B.V. All rights reserved.