Rodlike 4,6-diamino-1,3,5-triazine derivatives, effect of the core length on mesophase behavior and their application as LE-LCD device

Three series of diaminotriazine derivatives with different core length have been synthesized, and the influence of the structural variation as well as the temperature on their mesophase behaviour were systematically investigated. With focus on the formation of Cub_I/Im3¯m phase, multiple 2D/3D phases were discovered. Confirmed by polarized optical microscope, small/wide angle X-ray scattering, grazing incident small-angle X-ray scattering as well as molecular dynamics simulation, the results indicate that molecular curvature is critical to self-assembly structures. Moreover, the prerequisite for the formation of the Cub_I/Im3¯m phase is intermediate molecular curvature on the surface of the micelle to allow the intercalation of the alkyl chains. Finally, the potentials for such compounds as light-emitting liquid crystal display (LE-LCD) device has been initially demonstrated.