Phosphorus phosphorus compounds with the coordination number 4

A new synthesis of benzoyl phosphate: a substrate for acyl phosphatase assay.

Abstract: A new method for the synthesis of benzoyl phosphate was reported. The advantages are: 1. more rapid procedure; 2. lower cost; 3. higher yield.

Crystalline insoluble acid salts of tetravalent metals—XXIII: Preparation and main ion exchange properties of highly hydrated zirconium bis monohydrogen orthophosphates☆

Abstract: The conversion of Zr(HPO4)2 · H2O into ZrHNa(PO4)2 · 5H2O, followed by regeneration with dilute solutions of HCl, yields a mixture of zirconium phosphate materials with various degrees of hydration and different interlayer distances. The relative amounts of the hydrated phases in the mixture were strongly dependent on the method of preparation of the employed Zr(HPO4)2 · H2O. Under appropriate experimental conditions, 100% of a phase having an interlayer distance of 10.4 A (already reported as Zr(HPO4)2 · 8H2O and called ϑ-ZP) has been obtained. The stability of the various hydrated phases in HCl solutions of different concentrations was investigated and a valuation of their water content was attempted. The ion exchange properties of ϑ-ZP for alkali, alkaline earth and some divalent transition metal ions have been investigated in detail and a comparison with the ion exchange properties of Zr(HPO4)2 · H2O is made. ϑ-ZP and other highly hydrated dihydrogen phases, owing to their expanded interlayer distance, can easily exchange several cations which are not, or only slowly, exchanged on the monohydrate dihydrogen form due to steric hindrance. This fact considerably enlarges the practical use of crystalline zirconium phosphate.