Accession Number:

ADA023526

Title:

Chemistry of Mesomorphic Compounds.

Descriptive Note:

Final rept. May 63-Jun 71,

Corporate Author:

ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Report Date:

1975-11-01

Pagination or Media Count:

53.0

Abstract:

This final report summarizes synthetical efforts in the chemistry of cholesteric liquid crystals and the temperature sensitivity of their visible selective reflection spectra. Eleven homologous series of alkanoates, omega-phenylalkanoates, alkyl carbonates, and S-alkyl thiocarbonates of cholesterol, cholest-5-en-3 beta-thiol, and 5 alpha-cholestan-3 beta-o1 were prepared and their mesomorphic properties investigated. In addition, numerous other derivatives of these and other 3 beta-sterols were synthesized in order to study the influence of various parameters, such as modified 17 beta-side chain, double bonds, and polar substituents on the mesomorphic properties. The research culminated with the discovery that S-cholesteryl 14-phenyltetradecanethioate reflects the spectral range of 420-600 nm within 0.07C and thereby allows the detection of temperature variations of 2 x 0.00002C.

Subject Categories:

  • Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE