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Research Group, Summer 2011

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 2011

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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 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 new soft-crystalline phase exhibited by our ionic liquid crystal. Bottom: an example of recently studied polar nematic 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: • Progress in the chemistry of the [1-closo-CB9H10]- cluster (ref 1) led to new high De nematics for display applications (ref 2,3). These compounds are subject to patent protection and a joint project with E. Merck company. • A record high De = 113 (!) was measured for one of the new compounds (ref 2,3). • Synthetic methods have been improved and multigram quantities of such polar materials are now available (ref 4). • These and other results on boron clusters are described in a chapter of a recent book (ref 5). Research Group, Summer 2011 Graduate Students: Jacek Pecyna and Bryan Ringstrand. Bryan graduated in March and left for Argonne NL. Undergraduates: Lillian Johnson and Rich Denicola graduated in May and started medical schools of their choice. Harrison Gray, Kristein Mason, and Ajan Sivaramamoorthy are raising seniors who have worked on the project since January. Postdoctoral associate: Dr. Aleksandra Jankowiak Selected recent publications: 1. Ringstrand, B.; Kaszynski, P.; Young, V. G. Jr.; Janousek, Z. Inorg. Chem.2010, 49, 1166. 2. Ringstrand, B.; Kaszynski, P. J. Mater. Chem.2010, 20, 9613. 3. Ringstrand, B.; Kaszynski, P. J. Mater. Chem. 2011, 21, 90. 4.   Pecyna, J.; Denicola, R. P.; Ringstrand, B.; Jankowiak, A.; Kaszynski, P. Polyhedron, 2011, 30, 000. 5.  Kaszynski, P. “closo-Boranes as Structural Elements for Liquid Crystals” in Boron Science: New Technologies & Applications, N. Hosmane, Ed.; CRC Press. 2011.

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