Abstract
The salt NaH2(PO4)0.48(AsO4)0.52·H2O (abbreviated as NDAP) derives from the NaH2PO4·H2O-NaH2AsO4·H2O system. The structural characteristics of the crystals were analyzed by means of X-ray diffraction, and solved from 3737 independent reflections with R1 = 0.019 and Rw2 = 0.045, then refined with 84 parameters. The following results have been obtained: space group P212121, a = 5.1383(5)Å, b = 8.3301(8)Å, c = 10.2492(10)Å and Z = 4. The crystal structure of NDAP is built up from a discrete tetrahedral P(As)O43- connected with O-H…O hydrogen bonds and through the electrostatic actions of Na+ cations.
