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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a616443.pdf


Report Date : Jun 2014


Pagination or Media Count : 10


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.


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