Search results
Results from the WOW.Com Content Network
Cobalt(II) chloride is an inorganic compound, ... Reaction of the anhydrous compound with sodium cyclopentadienide gives cobaltocene Co(C 5 H 5) 2.
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 ...
The compound is synthesized by the reaction of cobalt(II) chloride and ethylenediamine in hydrochloric acid in the presence of oxygen: 4 CoCl 2 + 8 en + 4 HCl + O 2 → 4 trans-[CoCl 2 (en) 2]Cl + 2 H 2 O. The initial product contains HCl, which is removed by heating.
The cobaloxime is slowly decomposed by acids and bases. With acids, the products of decomposition are dimethylglyoxime, cobalt salts, and pyridine; with bases, derivatives of other cobaloximes are formed, usually with the release of chloride ions. The complex has no reaction with hydrogen gas, and cannot carry oxygen as salcomine does.
An example of this reaction type is the conversion of butadiene to adipic acid. Cobalt catalysts (together with iron) are relevant in the Fischer–Tropsch process in which it is assumed that organocobalt intermediates form. Cobalt complexes have been applies to the synthesis of pyridine derivatives starting from alkynes and nitriles.
Cobaltocene is prepared by the reaction of sodium cyclopentadienide (NaC 5 H 5) with anhydrous cobalt(II) chloride in THF solution. Sodium chloride is cogenerated, and the organometallic product is usually purified by vacuum sublimation. [2]
Four dihalides of cobalt(II) are known: cobalt(II) fluoride (CoF 2, pink), cobalt(II) chloride (CoCl 2, blue), cobalt(II) bromide (CoBr 2, green), cobalt(II) iodide (CoI 2, blue-black). These halides exist in anhydrous and hydrated forms. Whereas the anhydrous dichloride is blue, the hydrate is red. [23] The reduction potential for the reaction ...
Comparison of chemical gardens grown by NASA scientists on the International Space Station (left) and on the ground (right) A chemical garden while growing Cobalt(II) chloride A chemical garden. A chemical garden is a set of complex biological-looking structures created by mixing inorganic chemicals.