Accession Number:

ADA616443

Title:

Cholesteric Liquid Crystal Glass Platinum Acetylides

Descriptive Note:

Interim rept. 6 May 2010-31 May 2014

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE

Personal Author(s):

• Cooper, Thomas M.
• Burke, Aaron R.
• Krein, Douglas M.
• Ziolo, Ronald F.
• Arias, Eduardo
• Moggio, Ivana
• Fratini, Albert
• Garbovskiy, Yuriy
• Glushchenko, Anatoliy V.

Report Date:

2014-06-01

Pagination or Media Count:

10.0

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-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.

Descriptors:

• *CHOLESTEROL
• *GLASS
• *LIQUID CRYSTALS
• *OPTICAL MATERIALS
• *PLATINUM
• BENZENE
• BENZOATES
• OPTOELECTRONICS
• PHASE TRANSFORMATIONS
• ROOM TEMPERATURE
• SYNTHESIS(CHEMISTRY)

Subject Categories:

• Organic Chemistry
• Physical Chemistry
• Ceramics, Refractories and Glass
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE