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Cobalt(II) carbonate is the inorganic compound with the formula CoCO 3. This pink paramagnetic solid is an intermediate in the hydrometallurgical purification of cobalt from its ores. It is an inorganic pigment, and a precursor to catalysts. [5] Cobalt(II) carbonate also occurs as the rare red/pink mineral spherocobaltite. [6]
Cobalt can easily react with nitric acid to form cobalt(II) nitrate Co(NO 3) 2. Cobalt(II) nitrate exists in the anhydrous form and the hydrate form, of which the hexahydrate is the most common. Cobalt nitrate hexahydrate (Co(NO 3) 2 ·6H 2 O) is a red deliquescence crystal that is easily soluble in water, [12] and its molecule contains cobalt ...
Cobalt(II) oxide is prepared by oxidation of cobalt powder with air or by thermal decomposition of cobalt(II) nitrate or the carbonate. [3] [4] Cobalt(II,III) oxide decomposes to cobalt(II) oxide at 950 °C: [7] 2 Co 3 O 4 → 6 CoO + O 2. It may also be prepared by precipitating the hydroxide, followed by thermal dehydration: [citation needed]
The preparation is often carried out in the presence of cyanide, converting the cobalt(II) salt into a pentacyanocobaltate(II) complex that reacts with carbon monoxide to yield K[Co(CO) 4]. Acidification produces cobalt tetracarbonyl hydride, HCo(CO) 4, which degrades near room temperature to dicobalt octacarbonyl and hydrogen.
Tris(acetylacetonato)cobalt(III) is prepared by the reaction of cobalt(II) carbonate and acetylacetone in the presence of hydrogen peroxide: [3]. 2 CoCO 3 + 6 CH 3 COCH 2 COCH 3 + H 2 O 2 → 2 Co(O 2 C 3 Me 2 H) 3 + 2 CO 2 + 4 H 2 O
An aqueous solution of cobalt(II) nitrate and hydrogen peroxide is added to a solution of sodium bicarbonate, leading to precipitation of the olive solid. [2] The method is a modification of the synthesis of what has been described as “Co 2 (CO 3) 3 ”. [3]
C. Cobalt ferrite; Cobalt lactate; Cobalt laurate; Cobalt metagermanate; Cobalt oleate; Cobalt sulfide; Cobalt(II) acetate; Cobalt(II) bromide; Cobalt(II) carbonate
Dicobalt octacarbonyl also reacts with alkynes to give dicobalt hexacarbonyl acetylene complexes with the formula Co 2 (CO) 6 (C 2 R 2). Because they can be removed later, the cobalt carbonyl centers function as a protective group for the alkyne.