Cholesteric Liquid Crystal Glass Platinum Acetylides
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 oC, then converted to a mixed crystalline/cholesteric 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2014
- Accession Number
- ADA616443
Entities
People
- Aaron R. Burke
- Albert Fratini
- Anatoliy V. Glushchenko
- Douglas M. Krein
- Eduardo Arias
- Ivana Moggio
- Ronald F. Ziolo
- Thomas M Cooper
- Yuriy Garbovskiy
Organizations
- Air Force Research Laboratory