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Diss Factsheets
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EC number: 215-035-9 | CAS number: 1271-19-8
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- other:
Reference
In aqueous solutions, hydrolysis of both the halide ligands and the cyclopentadiene rings occur. The rate of these two processes is highly dependent on both the transition metal ion, the nature of the halide ligand, and the solution pH.
In unbuffered solutions of water (pH ~ 3) or in 0.32 M KNO3 reversible rapid hydrolysis of the first chloride ligand occurs in Cp2MCl2 (M = Ti,V, Mo, Zr) to give an aquated intermediate, followed by a slower dissociation of the second chloride [50 min M = Ti; 30 min M = V;24 min M = Zr; 6.7 min M = Mo], Fig. (2a). From Fig. (2a), it can be seen that both the concentration and solution pH will affect the equilibrium reactions, with the rate of chloride hydrolysis expected to be decreased at low pH and in high concentrations of salt since the equilibrium lies in favour of the metallocene dichloride. While detailed studies of the hydrolysis of other halide or acido ligands has not been reported, all studies are consistent with a similar rapid dissociation of these ligands to generate aquated species in which the Cp ligands remain coordinated to the metal at low pH.
It has also been stated that loss of chloride or acido ligand seems to be associated with dissolution of the complexes.
The estimated half lives for loss of the Cp rings in Cp2MCl2 (M = Ti) water or in 0.32 M KNO3 at 37 °C and at low pH (pH ~ 3), are as follows: Cp2TiCl2 (t1/2 = 57h).
Figure 2a and 2b are depicted under illustration.
Description of key information
The endpoint is waived as it was not feasible to undertake hydrolysis characterization testing as detailed within the regulatory methods. Supporting literature studies are included.
Key value for chemical safety assessment
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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