Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques

MO 14.9: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Mesophase Behaviour of Binary Mixtures of Symmetric Ester-Type Banana-Shaped Compounds — •Miroslav Cvetinov¹, Maja Stojanović¹, Dušanka Obadović², Aniko Vajda³, Katalin Fodor-Csorba³, Nandor Eber³, Nemanja Trišović⁴, and Jelena Antanasijević⁴ — ¹University of Novi Sad, Faculty of Sciences, Department of Physics, Novi Sad, Serbia — ²University of Novi Sad, Faculty of Education, Sombor, Serbia, — ³Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary — ⁴University of Belgrade, Faculty of Chemistry, Belgrade

We have investigated three binary mixtures composed of two symmetric ester-type banana-shaped compounds. Compound I is 2,6-bis[2-(4-ethanoyloxyphenyl)ethenyl] pyridine, which is banana-shaped mesogen expressing banana B1 mesophase at high temperature range. Compound II, 1,3-phenylene-bis4[4'-(9-decenyloxy)benzoyloxy] benzoate, doesn't exhibit any mesophase in cooling down to its crystallization temperature. The occurring mesophases have been identified by their optical textures and by the means of X-Ray diffraction. Molecular models were prepared using RM1 model of semi-empirical quantum chemistry. At the concentration of 27wt% of compound II, there is apparent lowering of B1 mesophase temperature range in respect to the pure compound I. Yet, at the concentration of 36wt% of compound II, the mixture lost its mesogenic character. Hence, mixing two classic banana-shaped compounds is viable way to attain mesophase range closer to the room temperature.