Gas Chromatographic Separation of Isomeric Phenols by Schiff`s Base Liquid Crystalline Stationary Phases

Authors

  • Rana A Hammza Department of Chemistry, College of Science, Al-Nahrain University, Baghdad-Iraq.

Keywords:

Gas chromatography, Stationary phase, Liquid crystals

Abstract

Abstract:

The chromatographic behaviour of liquid crystalline compounds 4-(propyloxybenzylidene)-4`-p-aminoazobenzene (1) and 4-(butyloxybenz--ylidene)-4`-p-aminoazobenzene (2) as stationary phases for the separation of cresol isomers was investigated. These isomers were analysed on 4-(propyloxybenzylidene)-4`-p-aminoazobenzene within a nematic range of 142- 153° C with a temperature interval of 5° C. Better peak resolution was at a column temperature of 147° C. The analysis was repeated on a and 4-(butyloxybenzylidene)-4`-p-aminoazobenzene column at a nematic temperature of 176° C, which represented the end of the nematic range, and gave the optimum peak resolution. It was found that isomer better separation was obtained at 20% loading for both liquid crystal materials. Other columns of different liquid crystalline percentages (15% and 25%) were used. A chromatogram with unoverlapped peaks was only obtained in both cases at 20% column loading. The order of elution isomers under the applied chromatographic conditions is discussed. The separation of these isomers is also discussed on the basis of stereo chemical conformations.

 

Published

2013-06-01

Issue

Section

Articles

How to Cite

(1)
Gas Chromatographic Separation of Isomeric Phenols by Schiff`s Base Liquid Crystalline Stationary Phases. ANJS 2013, 16 (2), 70-76.