Cobalt tricarbonyl nitrosyl

Cobalt tricarbonyl nitrosyl is the organocobalt compound with the formula Co(CO)₃(NO). It is a dark red volatile oil that is soluble in nonpolar solvents. The compound is one of the simplest metal nitrosyls. It is highly toxic, reminiscent of the same property for nickel tetracarbonyl.

Cobalt tricarbonyl nitrosyl

Names
Other names Cobalt nitrosyl tricarbonyl
Identifiers
CAS Number	14096-82-3
3D model (JSmol)	Interactive image
ChemSpider	21241479
ECHA InfoCard	100.034.481
EC Number	237-945-5
PubChem CID	13539873 (charge error)
InChI InChI=1S/3CO.Co.NO/c3*1-2;;1-2/q;;;+1;-1 Key: XDBBIZGDISXSEJ-UHFFFAOYSA-N
SMILES [C]=O.[C]=O.[C]=O.N(=O)[Co]
Properties
Chemical formula	C3CoNO4
Molar mass	172.969 g·mol−1
Appearance	red oil
Density	1.47 g/cm3
Melting point	−1.1 °C (30.0 °F; 272.0 K)
Boiling point	50 °C (122 °F; 323 K)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	toxic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis and reactions

Cobalt tricarbonyl nitrosyl is prepared by the treatment of dicobalt octacarbonyl with nitric oxide:^[1]

Co₂(CO)₈ + 2 NO → 2 Co(CO)₃NO + 2 CO

Many other methods have been developed.

The complex undergoes substitution readily by Lewis bases such as tertiary phosphines and isocyanides, concomitant with loss of CO.^[2]