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Cholesteric liquid crystal glass platinum acetylides

Published online by Cambridge University Press:  21 August 2014

Thomas M. Cooper ,
Aaron R. Burke ,
Douglas M. Krein ,
Ronald F. Ziolo ,
Eduardo Arias ,
Ivana Moggio ,
Albert Fratini ,
Yuriy Garbovskiy  and
Anatoliy V. Glushchenko
Thomas M. Cooper
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH, 45433
Aaron R. Burke
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH, 45433
Douglas M. Krein
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH, 45433
Ronald F. Ziolo
Affiliation:
Centro de Investigacion en Quimica Aplicada(CIQA), Boulevard Enrique Reyna 140,25294 Saltillo, Coahuila, Mexico
Eduardo Arias
Affiliation:
Centro de Investigacion en Quimica Aplicada(CIQA), Boulevard Enrique Reyna 140,25294 Saltillo, Coahuila, Mexico
Ivana Moggio
Affiliation:
Centro de Investigacion en Quimica Aplicada(CIQA), Boulevard Enrique Reyna 140,25294 Saltillo, Coahuila, Mexico
Albert Fratini
Affiliation:
Department of Chemistry, University of Dayton, Dayton, OH 45469
Yuriy Garbovskiy
Affiliation:
Department of Physics, University of Colorado at Colorado Springs, Colorado Springs, CO 80933
Anatoliy V. Glushchenko
Affiliation:
Department of Physics, University of Colorado at Colorado Springs, Colorado Springs, CO 80933
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Abstract

To prepare cholesteric liquid crystalline nonlinear optical materials with ability to be vitrified on cooling and form long time stability cholesteric glasses at room temperature, a series of platinum acetylide complexes modified with cholesterol has been synthesized. The materials synthesized have the formula trans-Pt(PR3)(cholesterol (3 or 4)-ethynyl benzoate)(1-ethynyl-4-X-benzene), where R = Et, Bu or Oct and X = H, F, OCH3 and CN. A cholesteric liquid crystal phase was observed in the complexes R = Et, and X = F, OCH3 and CN but not in any of the other complexes. When X = CN, a cholesteric glass was observed at room temperature which remained stable up to 130 °C, then converted to a mixed crystalline/cholesteric phase and completely melted to an isotropic phase at 230 °C. When X = F or OCH3 the complexes were crystalline at room temperature with conversion to the cholesteric phase upon heating to 190 and 230 °C, respectively. In the series X = CN, OCH3 and F, the cholesteric pitch was determined to be 1.7, 3.4 and 9.0 µ, respectively.

Keywords

liquid crystaloptoelectronicorganometallic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1698: Symposium JJ – Materials, Processes and Devices for Nanophotonics, Nonlinear Optics and Resonant Optics , 2014 , mrss14-1698-jj05-01
Copyright
Copyright © Materials Research Society 2014 

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References

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