Structure and properties of the layer compound NaZnAsO4 · 2H2O
Abstract
The title compound was prepared by heating an aqueous solution of sodiumhydroxide, zincchloride and arsenic acid at 350 K until a dry crystalline residue remained. The crystal structure of NaZnAsO4 · 2H2O was determined from single crystal diffractometer data: P[unk], a = 561.08(3) pm, b = 608.75(4) pm, c = 795.15(5) pm, α = 86.64(1)°, β = 88.74(1)°, γ = 89.19(1)°, V = 0.2710 nm3, Z = 2, R = 0.042, wR2 = 0.097 for 2650 structure factors and 99 variable parameters. The structure is built up from two-dimensional-infinite layers formed by ZnO4- and AsO4-tetrahedra which are separated by water molecules and sodium cations. Magnetic susceptibility measurements are compatible with diamagnetism with a susceptibility of χmol = −0.929 · 10−9 m3/mol. Infrared spectroscopy measurements indicate the existence of two crystallographic different water molecules in the structure. The thermogravimetric analysis and differential scanning calometry show a total loss of 13.4(1)wt-% water up to 1000 K (theoretical 13.7 wt-% in total) in five steps where the first four occur in the temperature range of 360 K – 430 K followed by a fifth step up to 450 K. Temperature depending X-ray powder diffractometer investigations confirm this behaviour which resulted in the formation of the structure of NaZnAsO4(I).
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