Molybdocene dihydride

Molybdocene dihydride is the organomolybdenum compound with the formula (η5-C5H5)2MoH2. Commonly abbreviated as Cp2MoH2, it is a yellow air-sensitive solid that dissolves in some organic solvents.

Molybdocene dihydride
Other names
3D model (JSmol)
  • InChI=1S/2C5H5.Mo.2H/c2*1-2-4-5-3-1;;;/h2*1-5H;;;/q-5;-1;;;
  • [cH-]1cccc1.[cH-]1cccc1.[H][Mo][H]
Molar mass 228.16 g·mol−1
Appearance yellow-brown powder
Melting point 163–165 °C (325–329 °F; 436–438 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

The compound is prepared by combining molybdenum pentachloride, sodium cyclopentadienide, and sodium borohydride.[1][2] The dihydride converts to molybdocene dichloride upon treatment with chloroform:

The compound adopts a "clamshell" structure where the Cp rings are not parallel.[3]


  1. ^ Silavwe, Ned D.; Castellani, Michael P.; Tyler, David R. (1992). "Bis(η5-Cyclopentadienyl)Molybdenum(IV) Complexes". Inorganic Syntheses. Inorganic Syntheses. Vol. 29. pp. 204–211. doi:10.1002/9780470132609.ch50. ISBN 9780470132609.
  2. ^ Green, M. L. H.; McCleverty, J. A.; Pratt, L.; Wilkinson, G. (1961). "The di-π-cyclopentadienyl hydrides of tantalum, molybdenum, and tungsten". Journal of the Chemical Society: 4854–9. doi:10.1039/JR9610004854.{{cite journal}}: CS1 maint: uses authors parameter (link)
  3. ^ K. Prout, T. S. Cameron, R. A. Forder, and in parts S. R. Critchley, B. Denton and G. V. Rees "The crystal and molecular structures of bent bis-π-cyclopentadienyl-metal complexes: (a) bis-π-cyclopentadienyldibromorhenium(V) tetrafluoroborate, (b) bis-π-cyclopentadienyldichloromolybdenum(IV), (c) bis-π-cyclopentadienylhydroxomethylaminomolybdenum(IV) hexafluorophosphate, (d) bis-π-cyclopentadienylethylchloromolybdenum(IV), (e) bis-π-cyclopentadienyldichloroniobium(IV), (f) bis-π-cyclopentadienyldichloromolybdenum(V) tetrafluoroborate, (g) μ-oxo-bis[bis-π-cyclopentadienylchloroniobium(IV)] tetrafluoroborate, (h) bis-π-cyclopentadienyldichlorozirconium" Acta Crystallogr. 1974, volume B30, pp. 2290–2304. doi:10.1107/S0567740874007011