Naslov
Extraction of 4-(2-pyridylzao) resorcionol and 4-(2-thiazolylazo) resorcinol with chloroform and tetraphenylarsonium and phosphonium chlorides

Autori
Marić, Ljiljana ; Široki, Marija

Izvornik
Analytica chimica acta (0003-2670) 318 (1996); 345-355

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
4-(2-Pyridylzao)resorcionol; 4-(2-Thiazolylazo)resorcinol; Extraction

Sažetak
The extraction of 4-(2-pyridylzao) resorcionol (PAR) and 4-(2-thiazolylazo) resorcinol (TAR) with chloroform alone and in the presence of tetraphenylarsonium or tetraphenylphosponium chloride (Ph4 XCl) was studied. In the optimum pH range 3.5-5 for PAR and 1.5-5 for TAR, 94-95% of the reagents was extracted into chloroform. In the presence of (Ph4 Xcl in 10-100-fold excess 95-98% of PAR and TAR were extracted within the pH range 3.5-10 and 1.5-10, respectively. The species extracted with chloroform alone were estimated to be H2R molecules. A quantitative interpretation of PAR and TAR distribution between aqueous solution (ľ =0.33) and chloroform was made. Distribution constants for H2R were determined as 14.9 for PAR and 19.2 for TAR. In the presence of Ph4 XCl as extractant H2R molecules were predominantly extracted up to pH; between pH 4 and pH 8 two species H2R Ph4X+HR- were transferred on the chloroform phase. Above pH 8 the Ph4X+HR- ion pairs were only extracted species. They were studied in solution and by characterization of solid compounds isolated from the organic phase and aqueous solution.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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