Triphenylene-ethylammonium tetrachlorometallate salts: multicolumnar mesophases, thermochromism and Langmuir films

This study reports new mesomorphic benzylethylammonium salts containing a 2,3,6,7,10-pentakis(dodecyloxy)-11-(hexyloxy)triphenylene unit and Cl- or [MCl4](2-) (M = Cu, Ni, Co, Mn) as counterions. They show a rich columnar polymesomorphism, characterized by polarized optical microscopy (POM), differential scanning calorimetry (DSC), and small- and wide-angle X-ray scattering (S/WAXS). All the compounds self-organize into multisegregated structures in the solid state and in the mesophases, with the alternation within large superlattices of triphenylene-containing columns and benzylammonium chloride or tetrachorometallate fragments. Interestingly, the nickel derivative displays a continuous and reversible thermochromic behavior in the range of 50-80 degrees C. Magnetic measurements and UV-Vis data at different temperatures, support changes in the coordination sphere of the Ni(ii) atom from octahedral to tetrahedral. Furthermore, these systems form stable and homogeneous Langmuir films at the air-water interface. These films have been successfully transferred onto solid substrates giving rise to nanostructured LB films with a clearly defined bilayer structure in which each layer consists of molecular columns aligned along the surface.

Automated summary

This study reports on the mesomorphic behavior and thermochromic properties of benzylethylammonium salts with specific structural units and different counterions, as well as their ability to form stable and homogeneous Langmuir and nanostructured LB films.