Chromium nitrate nonahydrate

Synonym(s) Chrome Chrom (German) Acetic acid, chromium Chrome (French) salt, hydrate chromic acetate, hydrate Nitric acid, chromium (III) salt, nonahydrate chromium nitrate, nonahydrate Chromium trichloride... 

Characteristic Chromium(O) Chromium(lll) acetate, monohydrate Chromium(lll) nitrate, nonahydrate Chromium(lll) chloride... 

Cr catalysts supported on zeolites were prepared by impregnation method. The loading of Cr was 10wt%. Chromium (III) nitrate nonahydrate (Wako Pure Chemical) was used as the source of Cr. After impregnation for a day, the wet catalysts were dried at 100°C in an oven, followed by calcination at 700°C for 3 h in air. 

Co (0.07), Sn (0.065), Ba (0.013 and W (0.078). Evaporation of the methanolic solution in high vacuum over CaCl2 eventually yields pure deep violet rhombic crystals of chromium (IH) nitrate nonahydrate. An aqueous solution of this salt becomes green on heating but reverts to the violet colour on cooling. 

Methylphenol in ethanolic solution treated with ferric nitrate nonahydrate (1 equiv.) and heated briefly for 30 sec. afforded an 83% yield of 4-methyl-2-nitrophenol. Under similar conditions 4-chlorophenol gave 4-chloro-2-nitrophenol (88%), 4-bromophenol gave 4-bromo-2-nitrophenol (64%) and 2-chlorophenol, a mixture of 2-chloro-4-nitrophenol (56%) and 2-chk>ro-6-nitrophenol (35%). Aluminium, chromium and copper(ll) nitrates were also used (ref.63). 

Jain SK (1978) Refractive index of molten Lewis acid salt hydrates mixtures of chromium(III) nitrate nonahydrate -i- calcium nitrate tetrahydrate. J Chem Eng Data 23 216-218... 

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