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Names | |
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Other names
bis(cyclopentadienyl)hafnium dichloride
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Identifiers | |
3D model (
JSmol)
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ChemSpider | |
ECHA InfoCard | 100.031.967 |
EC Number |
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PubChem
CID
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Properties | |
C10H10Cl2Hf | |
Molar mass | 379.58 g·mol−1 |
Appearance | white solid |
Melting point | 230–233 °C (446–451 °F; 503–506 K) |
Hazards | |
GHS labelling: [1] | |
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Danger | |
H314, H315, H319, H335 | |
P260, P261, P264, P264+P265, P271, P280, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P351+P338, P305+P354+P338, P316, P319, P321, P332+P317, P337+P317, P362+P364, P363, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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Hafnocene dichloride is the organohafnium compound with the formula (C5H5)2HfCl2. It is a white solid that is sparingly soluble in some organic solvents. The lighter homologues zirconacene dichloride and titanocene dichloride have received much more attention. While hafnocene is only of academic interest, some more soluble derivatives are pre catalysts for olefin polymerization. Moreso than the Zr analogue, this compound is highly resistant to reduction.
It is prepared by a salt metathesis reaction from hafnium tetrachloride by salt metathesis:
Hydrolysis gives the trimer [(C5H5)2HfO]3. [2]
The chloride ligands can be replaced by other halides. [3]
The bis( phosphide) (C5H5)2Hf(PR2)2 can be prepared by salt metathesis from hafnocene dichloride. [4]