Symmetric Liquid Crystal Dimers Containing a Luminescent Mesogen: Synthesis, Mesomorphic Behavior, and Optical Properties

Abstract New thermotropic liquid crystalline dimers containing chromophoric units into calamitic mesogens have been synthesized and studied. Cyan, pyrrole, indole and diphenyl moieties were chosen as chromophoric units. The thermotropic behavior of the dimers was monitored by polarized light microscopy, differential scanning calorimetry, and variable temperature X-ray diffraction measurements. The photophysical properties were studied by UV-vis and photoluminescence spectroscopy. All the dimers have mesomorphic behavior and emit violet, indigo, or blue light, in solution and film. Keywords: AzomethineDimerLiquid crystalCyanPyrroleIndoleDiphenyl Acknowledgments The financial support of European Social Fund, "Cristofor I. Simionescu" Postdoctoral Fellowship Program (ID POSDRU/89/1.5/S/55216), Sectoral Operational Program Human Resources Development 2007–2013 is acknowledged.