Cycloheptatrienemolybdenum tricarbonyl
  • 12125-77-8
3D model (JSmol)
  • InChI=1S/C7H8.3CO.Mo/c1-2-4-6-7-5-3-1;3*1-2;/h1-6H,7H2;;;;
  • [C-]#[O+].[C-]#[O+].[C-]#[O+].C1C=CC=CC=C1.[Mo]
Molar mass 272.12 g·mol−1
Appearance red-orange solid
Density 1.81 g/cm3
Melting point 100–101[1] °C (212–214 °F; 373–374 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Cycloheptatrienemolybdenum tricarbonyl is the organomolybdenum compound with the formula (C7H8)Mo(CO)3. It is a red-orange solid that is soluble in nonpolar organic solvents. The compound has no practical value but is a prototypical complex of cycloheptatriene.

Synthesis, structure, and reactions[]

The compound is prepared by thermal reaction of the triene with molybdenum hexacarbonyl:[2]

C7H8 + Mo(CO)6 → (C7H8)Mo(CO)3 + 3 CO

The compound is a piano stool complex, consisting of Mo(CO)3 bound to six carbon centers of the triene. The methylene group projects from the plane of the six coordinated carbon atoms.[3]

The compound reacts with trityl salts to give the cycloheptatrienyl complex:[4]

(C7H8)Mo(CO)3 + (C6H5)3C+ → [ (C7H7)Mo(CO)3]+ + (C6H5)3CH


  1. ^ "Tricarbonyl(cycloheptatriene)molybdenum(0)". Sigma Aldrich. Retrieved 11 October 2017.
  2. ^ F. A. Cotton, J. A. McCleverty, J. E. White, "Cycloheptatrienemolybdenum(0) Tricarbonyl" Inorganic Syntheses 1967, volume 9, pp. 121–122. doi:10.1002/9780470132401.ch32
  3. ^ J. D. Dunitz and P. Pauling "Struktur des Cycloheptatrien-molybdän-tricarbonyls, C7H8Mo(CO)3" Helv. Chim. Acta 1960 volume 43, pp. 2188-2197. doi:10.1002/hlca.19600430744
  4. ^ M. L. H. Green, D. K. P. Ng "Cycloheptatriene and -enyl Complexes of the Early Transition Metals" Chemical Reviews 1995, volume 95, pp. 439-73. doi:10.1021/cr00034a006