Molybdocene dichloride
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| Names | |||
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| IUPAC name
dichlorobis(η5-cyclopentadienyl)molybdenum(IV)
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| Other names
molybdocene dichloride,
molybdenocene dichloride, dichloridobis(cyclopentadienyl)molybdenum(IV) | |||
| Identifiers | |||
3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |||
| C10H10Cl2Mo | |||
| Molar mass | 297.04 g·mol−1 | ||
| Appearance | greenish-brown powder | ||
| insoluble, moisture sensitive | |||
| Hazards | |||
| Safety data sheet (SDS) | [1] | ||
| Related compounds | |||
Related compounds
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Ferrocene Zirconocene dichloride Vanadocene dichloride Niobocene dichloride Titanocene dichloride Tantalocene dichloride | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Molybdocene dichloride is the organomolybdenum compound with the formula (η5-C5H5)2MoCl2 and IUPAC name dichlorobis(η5-cyclopentadienyl)molybdenum(IV), and is commonly abbreviated as Cp2MoCl2. It is a brownish-green air- and moisture-sensitive powder. In the research laboratory, it is used to prepare many derivatives.
Preparation and structure
[edit | edit source]The compound is prepared from molybdocene dihydride by treatment with chloroform:[2]
- (C5H5)2MoH2 + 2 CHCl3 → (C5H5)2MoCl2 + 2 CH2Cl2
The compound adopts a "clamshell" structure where the Cp rings are not parallel, the average Cp(centroid)-M-Cp angle being 130.6°. The two chloride ligands are cis, the Cl-Mo-Cl angle of 82° being narrower than in niobocene dichloride (85.6°), which in turn is less than in zirconacene dichloride (92.1°). This trend helped to establish the orientation of the HOMO in this class of complex.[3]
Uses
[edit | edit source]Unlike the titanocene and zirconacene derivatives, the molybdocene compounds have yielded no commercial applications.
All metallocene dihalides exhibit some anti-cancer activity,[4] but these have not yielded useful compounds in the clinic.[5]
References
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- ^ 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. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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