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In case of COF-1, three boronic acid molecules converge to form a planar six-membered B 3 O 3 ring with the elimination of three water molecules. [5] Reversible reactions for COF formation featuring nitrogen to form a variety of linkages (imine, hydrazone, azine, squaraine, phenazine, imide, triazine).
CoF 3 is a powerful fluorinating agent. Used as slurry, CoF 3 converts hydrocarbons to the perfluorocarbons: 2 CoF 3 + R-H → 2 Co F 2 + R-F + HF. Co F 2 is the byproduct. Such reactions are sometimes accompanied by rearrangements or other reactions. [1] The related reagent KCoF 4 is more selective. [5]
Anhydrous cobalt(II) fluoride. Cobalt(II) fluoride is a chemical compound with the formula (CoF 2).It is a pink crystalline solid compound [1] [2] which is antiferromagnetic at low temperatures (T N =37.7 K) [3] The formula is given for both the red tetragonal crystal, (CoF 2), and the tetrahydrate red orthogonal crystal, (CoF 2 ·4H 2 O).
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(II) hydrated ions ([Co(H 2 O) 6 ] 2+ ) and free nitrate ions. [ 13 ]
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CF 4 + H 2 O → COF 2 + 2 HF. Carbonyl fluoride can also be prepared by reaction of phosgene with hydrogen fluoride and the fluorination of carbon monoxide, although the latter tends to result in over-fluorination to carbon tetrafluoride. The fluorination of carbon monoxide with silver difluoride is convenient: CO + 2 AgF 2 → COF 2 + 2 AgF
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