Polyfunctional Derivatives of Imidodiphosphoric Acid as Extractants

Abstract

The distribution of calcium, strontium, barium and scandium between aqueous and organic phases was studied using 0.1 M HNO3 or 0.01 to 0.1 M HCl as the aqueous phase and solutions of selected derivatives of organophosphoric reagents containing the conventional =P(O)NHP(O)= bifunctional group or the analogous trifunctional or tetrafunctional group in various organic solvents as the organic phase. The effect of substitution of one ester group by an OH or NH2 group was examined. While for the alkaline earth metals the distribution ratio increases if the bifunctional group is replaced by a higher-functional group, the reverse is true for scandium. The extraction efficiency is improved by the presence of OH or NH2 substituent groups. The composition of the extracted species was inferred by logarithmic analysis and the corresponding extraction constants were calculated.

Distribution and dimerization of some μ-imidodiphosphates

“…X-ray crystal structure analysis of TPh-OO [3] and TPh-SS [4,5] revealed that these compounds are formed in the crystal dimers via hydrogen bonds. Their very good solvation properties and some technological aspects were described earlier [4,6,7]. This work deals with the properties of the chelate-forming reagents specified above in the system aqueous phase -selected organic solvents.…”

Distribution and dimerization of some μ-imidodiphosphates

“…Some chlorofluoroalkane's solvents and CFC-112/B mixture were used as a highly inert, non-flammable and non-toxic organic phase. Their very good solvation properties and some technological aspects were described earlier [4,6,7].…”

Bi-Functional Organophosphorus Extractants and Computational Modeling for Copper(II) and Zinc(II) Extraction

“…To date, a lot of extractants have been developed and their extraction properties have been evaluated for a variety of metal ions. [1][2][3][4][5][6][7][8][9][10][11] In a previous study, we have developed novel bi-functional organophosphorus extractants in which two phosphonic acids were introduced as functional groups in the molecular structure for the separation of rare earth metals. 12 The result indicated that extraction performance of bi-functional extractants is very sensitive to the molecular structure of the spacer which connects the two functional moieties.…”