Struktur und Eigenschaften des Kaliumhydrogendiarsenit-Hemihydrats, KHAs2O4 · 1/2 H2O / Structure and Properties of the Potassiumhydrogendiarsenite-hemihydrate, KHAs2O4 · 1/2 H2O

Abstract

Abstract KHAs2O4 · 1/2 H2O crystallizes in the tetragonal space group I 4/m with the lattice constants a = 14,480 Å, c = 5,250 Å. The anion forms infinite chains, [HAs2O4]n n- , in the direction of the c axis. Arsenic is surrounded by three oxygens in trigonal pyramidal co-ordinations. Ultracentrifuge work shows that the solution contains monomeric species, probably [ASO(OH)2]-. Raman spectra gave no evidence for the existence of As-H-bonds either in the solid or in solution.