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Cholesteric Liquid Crystal Glass Platinum Acetylides
Interim rept. 6 May 2010-31 May 2014
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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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-PtPR3cholesterol 3 or 4-ethynyl benzoate1-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 oC, then converted to a mixed crystallinecholesteric phase and completely melted to an isotropic phase at 230 oC. When X F or OCH3 the complexes were crystalline at room temperature with conversion to the cholesteric phase upon heating to 190 and 230 oC, respectively. In the series X CN, OCH3 and F, the cholesteric pitch was determined to be 1.7, 3.4 and 9.0 , respectively.
APPROVED FOR PUBLIC RELEASE