Collect. Czech. Chem. Commun. 1992, 57, 1655-1657

Efficiency of Tetraphenylimido Diphosphate as an Extractant

Oldřich Navrátila and Eckhard Herrmannb

a Department of Chemistry, Military University, 682 03 Vyškov, Czechoslovakia
b Chemistry Section, Martin Luther University, 4010 Halle-Wittenberg, Germany


Tetraphenylimido diphosphate (HA) and five other bidentate reagents containing PO and CO groups in a close vicinity to phenyl or phenoxy groups were examined as reagent for solvent extraction of some metals. Hafnium, scandium and rare earth compounds were found to easily pass from weakly acid aqueous solutions into benzene solutions of HA, whereas the other reagents investigated mostly lack this extracting power. The causes of this effect are discussed.