The oxidation of chromous perchlorate with sodium azide in aqueous perchloric acid yielded three complex ions : hexa-aquochromium(II1) , pentaaquomonoamminechromium(m), and a binuclear chromium(II1) ammine. This complex, believed to have the structure (H,0),Cr-NH-Cr(H20),4f, was isolated as the sulphate. The presence of chloride ion affects the nature of the products. A reaction mechanism is suggested.
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