Higher oxidation states of silver—I
1961; Pergamon Press; Volume: 20; Issue: 1-2 Linguagem: Inglês
10.1016/0022-1902(61)80465-x
ISSN1878-1225
Autores Tópico(s)Pigment Synthesis and Properties
ResumoAqueous solutions of the silver salts AgNO3, Ag2SO4, AgClO4, AgF and AgC2H3O2 have been ozonized, the black crystalline products isolated and partially characterized by their composition, oxidizing power, magnetic properties and X-ray powder diffraction patterns.Oxidized products of the above compounds were found to have the empirical formulas Ag7O8NO3, Ag7O8SO4, Ag4O5, AgO and AgO, respectively. The nitrate and the new sulphate were found to be relatively stable in air, but they both decomposed to AgO upon being suspended in boiling water. Their X-ray patterns were indexed as face-centred cubic, with the sulphate having the slightly larger cell constant. The Ag4O5 compound was quite unstable, decomposing on standing within minutes. It was indexed with a simple cubic lattice and lines were also present due to AgO, which is monoclinic. All samples were paramagnetic except the AgO compounds obtained from AgF and AgC2H3O2, which were diamagnetic. Partial replacement of silver was effected only with Cd2+ although Ba2+, Mg2+ and Zn2+ were also tried. Suggestions are made concerning the formulation and structure of some of the higher oxides.
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