Bis(pentamethylcyclopentadienyl)hafnium(IV) dichloride
Bis(pentamethylcyclopentadienyl)hafnium(IV) dichloride (CAS 85959-83-7; C20H30Cl2Hf; molar mass 519.85 g/mol) is an organohafnium metallocene, the permethylated analogue of hafnocene dichloride. Supplied as a crystalline solid (melting point above 300 °C), it pairs a hafnium(IV) centre with two electron-rich pentamethylcyclopentadienyl ligands. It is used principally as a single-site catalyst precursor for olefin polymerisation and as a defined building block in organometallic and materials research.
- Synonyms
- Bis(pentamethylcyclopentadienyl)hafnium(IV) dichlorideDecamethylhafnocene dichlorideBis(1,2,3,4,5-pentamethylcyclopentadienyl)hafnium dichlorideDichlorobis(pentamethylcyclopentadienyl)hafniumHafnocene dichloride, decamethyl-(Cp*)2HfCl2
Single-site olefin polymerisation catalyst precursor
Activated with methylaluminoxane (MAO) or borate co-catalysts, it serves as a metallocene precursor for the polymerisation and copolymerisation of ethylene, propylene and higher alpha-olefins. The bulky pentamethylcyclopentadienyl ligands provide a sterically and electronically defined coordination environment.
Organometallic and coordination chemistry
The compound is a well-defined hafnium(IV) sandwich complex used as a starting material in the synthesis of other organohafnium species. It supports studies of ligand substitution, oxidative chemistry and structure-reactivity relationships at hafnium centres.
Reference compound for catalysis research
As a permethylated hafnocene, it is employed to benchmark steric and electronic effects against zirconocene and titanocene analogues in single-site catalyst development. It is valuable for academic and industrial method development.
Hafnium precursor for materials and thin-film studies
Its defined composition and thermal stability make it a useful molecular source of hafnium in exploratory materials chemistry. Use in any specific process should be qualified against the requirements of that application.
| Molecular weight | 519.85 |
|---|---|
| Empirical formula | C20H30Cl2Hf |
| Assay | 98% |
| Melting point | >300 °C(lit.) |
Hazard statements
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H315Causes skin irritation
- H319Causes serious eye irritation
- H332Harmful if inhaled
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 20/21/22-36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Bis(pentamethylcyclopentadienyl)hafnium(IV) dichloride used for?
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It is used chiefly as a single-site (metallocene) catalyst precursor for olefin polymerisation and copolymerisation, typically after activation with methylaluminoxane or borate co-catalysts. It also functions as a defined organohafnium building block in coordination chemistry and as a molecular hafnium source in materials research.
What is the CAS number and molecular formula of Bis(pentamethylcyclopentadienyl)hafnium(IV) dichloride?
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Its CAS number is 85959-83-7 and its empirical formula is C20H30Cl2Hf (Hill notation), with a molecular weight of 519.85 g/mol. The MDL number is MFCD00058887.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this material at a typical assay of 98%, as a research and technical grade organometallic reagent. We do not represent it as USP, BP or EP grade. A Certificate of Analysis can be provided, and specific assay or packaging requirements can be confirmed at the time of enquiry.
What are the safety and handling precautions for this compound?
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It carries GHS pictogram GHS07 with the signal word Warning. The hazard statements are H302, H312, H315, H319, H332 and H335 — harmful if swallowed, in contact with skin or if inhaled, and causing skin, eye and respiratory irritation. Handle with a type N95 dust mask, gloves and eye protection, avoid dust formation, and consult the Safety Data Sheet before use. It is classified WGK 3 (highly hazardous to water in Germany).
Is Bis(pentamethylcyclopentadienyl)hafnium(IV) dichloride a controlled or scheduled substance?
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The supplied data does not indicate any narcotic, psychotropic or precursor control status for this material. It is offered as a standard research and industrial organometallic reagent, subject to normal export and dangerous-goods requirements.
How is Bis(pentamethylcyclopentadienyl)hafnium(IV) dichloride packed, shipped and exported?
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It is packed as a solid in suitably sealed containers with sizes matched to your order, labelled in line with GHS and applicable transport rules. As an established exporter, Tech Serve Solutions arranges compliant documentation and global shipping; precise pack sizes and transport details are confirmed at the quotation stage.
How do I request a sample or quote?
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Contact Tech Serve Solutions with your required quantity, purity and destination, quoting CAS 85959-83-7. We will respond with availability, lead time, documentation and a formal quotation, and can arrange a sample where appropriate.
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