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Research Group, Summer 2010

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

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Research Group, Summer 2010

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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 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. Top: texture of a smectic A phase growing out of isotropic. Bottom: examples of recently studied polar liquid crystals containing boron clusters.

  2. Polar, Ionic and Reactive Liquid Crystalline Materials for Electrooptical, Battery, and Sensor Applications Piotr Kaszynski, Vanderbilt University, DMR 0907542 Highlights of recent results: • Further progress in the chemistry of the [1-closo-CB9H10]- cluster (ref 3) led us to new high De nematics for display applications. These compounds are subject to patent protection (ref 2). • A record high De = 113 (!) was measured for one of the new compounds in a nematic host (ref 2,4). • A formal replacement of a non-polar C–C fragment by a polar isosteric group N+–B- led to pairs of isosteric nematics, which answered an old fundamental question: How much does a molecular dipole moment stabilize a nematic phase? Schlieren texture of a nematic phase for one of our new compounds. Research Group, Summer 2010 Graduate Students: Bryan Ringstrand and Jacek Pecyna. Bryan gave a great talk at the 23rd ILCC and collected XRD data at Warsaw University. Undergraduates: Lillian Johnson and Rich Denicola (rising seniors at VU), Martin Oltmann and Jeff Batt (rising seniors at Augustana). Martin and Jeff were summer researchers supported by a supplement to this NSF award. Postdoctoral associate: Dr. Aleksandra Jankowiak Selected recent publications: 1. Ringstrand, B.; Kaszynski, P.; Januszko, A.; Young, V. G. Jr. J. Mater. Chem. 2009,19, 9204-9212. 2. Ringstrand, B. and Kaszynski, P. “Polar Nematic Compounds” US 61/287863. 3. Ringstrand, B.; Kaszynski, P.; Young, V. G. Jr.; Janousek, Z. Inorg. Chem.2010, 49, 1166-1179. 4. Ringstrand, B.; Kaszynski, P. J. Mater. Chem.2010, 20, 000.

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