Cobalt nitrosyl tricarbonyl

Carbonyl Nitric Oxides. Another group of metal-carbonyl complexes, worthy of investigation as CVD precursors, consists of the carbonyl nitric oxides. In these complexes, one (or more) CO group is replaced by NO. An example is cobalt nitrosyl tricarbonyl, CoNO(CO)3, which is a preferred precursor for the CVD of cobalt. It is a liquid with a boiling point of 78.6°C which decomposes at 66°C. It is prepared by passing NO through an aqueous solution of cobalt nitrate and potassium cyanide and potassium hydroxide. ... 

CONC304 COBALT NITROSYL TRICARBONYL -2295.1356 4.3067E+04 1.0148E+03 -1.4317E+00 7.7031E... 

CoNC304 COBALT NITROSYL TRICARBONYL 76.352 8.9853E-02 -2.4575E-05 -2.8140E-08 1.4023E-11 100 1500 gas... 

Co(NH3)6](N03)3 Hexammineco-balt(III) nitrate, 2 218 [Co(NH3)6]2(C204)3-4H20 Hexam-minecobalt(III) oxalate, 2 220 CoNO(CO)3 Cobalt nitrosyl tricarbonyl, 2 238, 239 Co2(S04)3-18H20 Cobalt (III) sulfate 18-hydrate, 5 181 Cr(CN)sK3 Potassium hexacyano-chromate(III), 2 203 Cr (CO) t Chromium hexacarbonyl, 3 156... 

The reaction is carried out at atmospheric pressure using a vapourization temperature of 150°C, a condenser temperature of 170°C, a carrier gas flow-rate of 1.2 to 2.8 1 min 1 and a deposition or substrate temperature of 340°C. These conditions are considered optimum because they produced thin metallic cobalt films having the same magnetic properties as bulk cobalt. A deposition time of 8 - 10 min resulted in films of about 0.6 pm thickness on glass substrates. Cobalt films can also be prepared by pyrolysis of cobalt nitrosyl tricarbonyl ... 

Cyanometallates, syntheses 62, 67, 72, 73, 78 Hexamminecobalt(III) salts, synthesis 69 Cobalt nitrosyl tricarbonyl, S3mthesis 76 Tetrammineplatinum(II) chloride, synthesis 80... 

Most of the carbonyls can be prepared by the direct combination of the metal with carbon monoxide. It is necessary that the metal be in a very active state as when freshly reduced from the oxide or a salt of the metal. While finely divided, freshly reduced nickel combines readily with carbon monoxide at room temperature and atmospheric pressure (synthesis 75) other metals require more elevated temperatures (up to 400 ) and very high pressures (up to 700 atm.). Cobalt nitrosyl tricarbonyl is produced when specially prepared cobalt is treated with a mixture of carbon monoxide and nitric oxide. 

The alkali salt of cobalt tetracarbonyl hydride can best be prepared by the absorption of carbon monoxide in an alkaline cobalt(II) cyanide suspension. Treatment of this solution with nitric oxide yields the volatile cobalt nitrosyl tricarbonyl/ while treatment with acid yields the volatile cobalt tetracarbonyl hydride. At room temperature, the latter compound decomposes into hydrogen and the nonvolatile dicobalt octacarbonyl, [Co(CX))4]2. 

The product thus obtained in the trap is reasonably pure. Any trace of cobalt tetracarbonyl hydride is eliminated by allowing the trap to stand at room temperature for 24 hours. The trap is then cooled again to about —79° and the system connected to a prepared sample tube. After the system has been evacuated, the trap is allowed to warm up. Cooling the sample tube causes the cobalt nitrosyl tricarbonyl to distill into the latter. Finally, the capillary of the sample tube is sealed in the flame. Yield 2.5 g. (58 pe cent). 

Cobalt nitrosyl tricarbonyl is a deep-red mobile liquid. It is not soluble in water, nor does it react with water, but it is completely miscible with most oi anic solvents. 

Ni(CO)4 Nickel tetracarbonyl [Co(CO)4]2 Dicobalt octacarbonyl CoNO(CO)3 Cobalt nitrosyl tricarbonyl H2Fe(CO)4 Iron tetracarbonyl dihydride... 

---