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Cr 134 (SmA 133) N 144 I

Polar, Ionic and Reactive Liquid Crystalline Materials for Electrooptical, Battery, and Sensor Applications Piotr Kaszynski, Vanderbilt University, DMR 0907542.

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Cr 134 (SmA 133) N 144 I

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  1. Polar, Ionic and Reactive Liquid Crystalline Materials for Electrooptical, Battery, and Sensor ApplicationsPiotr Kaszynski, Vanderbilt University, DMR 0907542 Boron clusters (shown below) are unusual inorganic cage compounds that we have been exploring as structural elements in liquid crystals. Their atypical geometry and electronic structures permit the design of functional materials suitable for flat panel display and Li+ ion battery applications, as well as the study of fundamental aspects of the liquid crystal phenomenon. Our multidisciplinary program is directed at synthesis and understanding of the behavior of rationally-designed liquid crystalline materials. The project involves quantum-mechanical calculations to aid in molecular design, development and application of inorganic/organic synthetic methods, structure-property relationship studies, and electrooptical characterization. Cr 134 (SmA 133) N 144 I Top: texture of a smectic A phase growing out of isotropic. Bottom: examples of recently studied ionic and polar liquid crystals containing boron clusters.

  2. Polar, Ionic and Reactive Liquid Crystalline Materials for Electrooptical, Battery, and Sensor ApplicationsPiotr Kaszynski, Vanderbilt University, DMR 0907542 Highlights of recent results: • Further progress in the chemistry of the [1-closo-CB9H10]- and [1-closo-CB11H12]- clusters (ref 1 and 2) led us to new ionic liquid crystals, some of which exhibit a rare nematic phase (see photograph to the left). • In parallel, we have develop access to high De liquid crystals derived from the [1-closo-CB11H12]- cluster as possible additives to materials for LCD. • We have improved and scaled up the synthesis of a key intermediate to high De derivatives of the [1-closo-CB9H10]- cluster (ref 3). These compounds are now being evaluated for their thermal and dielectric properties jointly with colleagues from Merck KGaA. Schlieren texture of a nematic phase for one of our new ionic liquid crystals. Research Group, Summer 2012 Graduate Students: Jacek Pecyna. Bryan Ringstrand was awarded the Glen Brown Prize for the best PhD theses in the area of liquid crystals and gave award address at the 24th ILCC this summer. Undergraduates: Kristein Mason (class of 2012), Ajan Sivaramamoorthy, and Eric Maertin. Kristein gave a talk at SERMACS in November 2011. Postdoctoral associate: Dr. Aleksandra Jankowiak • Selected recent publications: • Ringstrand , B.; Jankowiak, A.; Johnson, L. E.; Pociecha, D.; Kaszynski, P.; Górecka, E. J. Mater. Chem. 2012, 22, 4874. • 2. Pecyna, J.; Sivaramamoorthy, A.; Jankowiak, A.; Kaszynski, P. Liq. Cryst. 2012, 39, 965. • 3. Pecyna, J.; Denicola, R. P.; Ringstrand, B.; Jankowiak, A.; Kaszynski, P. Polyhedron, 2011, 30, 2505.

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