Abstract
A spectrophotometric study of chromium(III) azide solutions has shown that the intense green colour formed from the violet chromium(III) nitrate and sodium azide in dilute solutions, is due to a mono-azido-chromium(III) complex with two absorbancy maxima at wavelengths 442 and 605 mμ. The slope ratio method was applied and suggested the presence of such a complex. The results were confirmed by the continuous variation method. The molar ratio method was also applied for the determination of the instability constant of the 1:1 complex. It was found to be (2·14 ± 0·136) × 10 −2. There is a tendency for a stepwise formation of azide-rich complexes upon gradual increases in azide concentration. A deep blue solution, with absorbancy maxima at wavelengths 480 and 650 mμ, was formed in solutions containing a large excess of azide. Migration experiments proved the existence of positively and negatively charged complex ions in the green and the deep blue solutions respectively.
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