Abstract
Interaction of solid diphenyl(dibutylcarbamoylmethyl)phosphine oxide (Ph2Bu2) with perchloric and hydrochloric acid solutions was studied. On contact with the acids, this agent forms a liquid substance (“liquid reagent,” LR) exhibiting extractive power. The conditions of LR formation and extraction of Am(III) from HCl solutions with LR in the absence of organic diluent were studied. The solubility of Ph2Bu2 in 3 M HClO4 is 2.5 mg l-1. The composition of the LR formed in HClO4 solutions is 2Ph2Bu2·HClO4·nH2O. Perchloric acid is quantitatively backwashed from the LR phase with water. Formation of an Nd(III) complex with LR in HClO4 solutions is accompanied by cementation (solidification) of the compound. The resulting complex has the 3 : 1 [Ph2Bu2 : Nd(III)] composition and mp ∼120°C. According to the IR spectrum, the coordination of Ph2Bu2 with the HClO4 molecule is monodentate, and with the Nd(III) ion (in the absence of organic diluent) it is bidentate.
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