Cobalt fluoride, decomposition

Due to the low solubility of cobalt(II) fluoride in most solvents, formation of cobalt fluoro N-donor complexes (which are the only low-valent cobalt fluorides which are reliably reported) features a variety of starting materials. A common theme that runs throughout this work has been the use of [Co(BF4)2] as the fluoride source, and the subsequent controlled decomposition to obtain a metal-bound fluoride. This has been done, for example, with tris- (3,5-dimethyl-pyrazol-l-yl)methyl amine (amtd) to give [M2(amtd)2F(BF4)3(EtOH)Y(H20)] (M = Co, Cu, Zn x = 0-1.5, y = 1-2). The cobalt complex has been structurally characterised by X-ray diffraction [Fig. 3] [57]. Similarly, the combination of [M(BF4)2] (M = Mn, Co, Ni), [M(N03)2], NH4(NCS) and 3,5-diethyl-1,2,4-triazole (detrH) produces... 

Cobalt difluoride [10026-17-2] C0F2, is a pink solid having a magnetic moment of 4, 266 x 10 J/T (4.6 Bohr magneton) (1) and closely resembling the ferrous (Fep2) compounds. Physical properties are Hsted in Table 1. Cobalt(II) fluoride is highly stable. No decomposition or hydrolysis has been observed in samples stored in plastic containers for over three years. 

Cobalt salts are used as activators for catalysts, fuel cells (qv), and batteries. Thermal decomposition of cobalt oxalate is used in the production of cobalt powder. Cobalt compounds have been used as selective absorbers for oxygen, in electrostatographic toners, as fluoridating agents, and in molecular sieves. Cobalt ethyUiexanoate and cobalt naphthenate are used as accelerators with methyl ethyl ketone peroxide for the room temperature cure of polyester resins. 

In general, carbonyl forming metals such as nickel, iron or cobalt, must not be present in the formation of metallic carbonyls as their presence in one part of the apparatus may lead to the subsequent deposition uf the metal on the catalyst by the decomposition of the carbonyl in a hotter portion of the apparatus, with destruction of the catalyst activity. The catalysts may be activated by the addition of metal halides such as potassium fluoride or iodide, sodium chloride, or aluminum chloride.102... 

COBALT (7440-48-4) An extreme fire hazard. Pyrophoric particles or dust can self-ignite in air. Violent reaction with acetylene, ammonium nitrate, bromine pentafluoride, bromine trifluoride, cumene hydroperoxide, hydrogen peroxide (90%), nitryl fluoride, organic peroxides forms explosive mixture with potassium chlorate. Incompatible with sodium borohydride. Capable of promoting the decomposition of many organic materials. 

HAZARD RISK Powdered cobalt ignites spontaneously in air ignites on contact with bromine pentafluoride incandescent reaction with acetylene or nitryl fluoride explosive reaction with hydrazinium nitrate, ammonium nitrate plus heat, 1,3,4,7-tetramethylisoindole may produce acrid smoke and fumes when heated to decomposition NFPA code H2 FO RO (cobalt oxide and cobalt chloride). 

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