Metallomesogen Mixtures as Potential Materials for Application in Liquid Crystal Devices

Abstract

In this work, we present a new approach for development of metallomesogen (MOM) mixtures for potential applications in electrooptical devices. Through combination of molecular engineering and physical mixing technique, we propose to overcome the major drawbacks of MOMs, including their inaccessible transition temperature and low solubility in liquid crystal hosts. In the present study, we report on the miscibility of bi-ligand Cu, Ni and Pd complex salicylal-diaminates metallomesogens as model structures. Accordingly, we studied the phase diagrams of two binary MOM mixtures with different metals and ligands. The preliminary results indicate the complete mesogenic miscibility, distinct eutectic points and wide mesogenic range, which provide as model materials in electro-optical devices.

Metallomesogens as potential materials for improvement of electro-optical properties of commercial liquid crystals

“…The details of synthetic procesdures, transitions temperatures and mesogenic phases of this class of bi-ligand MOM chemistry have been reported elsewhere. [33][34][35][36][37][38][39]40 The utilized commercial Nematic Liquid Crystal (NLC) materials in this study include TN10427, TNO623 (Hofmann La Roche) and E43 (Merck). All NLC materials were used as such and details of their transition temperatures have been mentioned elsewhere.…”

“…All NLC materials were used as such and details of their transition temperatures have been mentioned elsewhere. 34 The phase transition temperatures of all utilized MOMs, commercial NLCs and their mixtures including the nematic-crystal (TNC) and isotropic-nematic (TIN) transition temperatures were determined by a Perkin Elmer model DSC7 Differential Scanning Calorimeter (DSC) and Nikon Eclipse-50i polarizing optical microscope (POM) equipped with a temperature-controlled Mettler FP5 microscopic hot-stage. The binary and ternary MOM and NLC mixtures were prepared by physical mixing method of binary MOM components.…”