Liquid crystals
| Autor: | B.V. Bapat, S.M. Likhite, B.B. Ghatge, D.G. Panse |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
Chromatography
Liquid crystalline Chemistry Organic Chemistry General Medicine Toluidines Ring (chemistry) Biochemistry Analytical Chemistry chemistry.chemical_compound Column chromatography Countercurrent chromatography Lateral substitution Liquid crystal Alkoxy group Structural isomer Gas chromatography Supercooling Benzene |
| Zdroj: | Journal of Chromatography A. 206:361-367 |
| ISSN: | 0021-9673 |
| DOI: | 10.1016/s0021-9673(00)82547-9 |
| Popis: | 2-R1-4′-R-4-(4-n-alkoxybenzoyloxy)azobenzenes, where R = n-butyl, methyl and methoxy, R1 = H and methyl and n-alkoxy = methoxy, ethoxy and n-butoxy were synthesized. They have long liquid crystalline “nematic” ranges and were used as stationary phases for the separation of positional isomers of di- and trisubstituted benzene. It was observed that lateral substitution (R1) on the middle ring has a profound influence on the relative retentions of these compounds. The separation of mixtures of free phenolic isomers such as m- and p-cresols was difficult, whereas the separation of α- and β-naphthols could be easily achieved. Similarly, the separation of mixtures of free bases such as toluidines or picolines was difficult, but naphtylamines were separated with great ease. Also, the complete separation of all positional isomers of monochlorobiphenyl was achieved by using these liquid crystalline substrates. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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