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Diss Factsheets
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EC number: 235-166-5 | CAS number: 12108-13-3
- 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
Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- other: expert statement
- Adequacy of study:
- key study
- Study period:
- 2010-07-05
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: The dissociation constant of mmt was assessed based on the structural formula of mmt.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Study of physical-chemical properties and molecular structure of mmt.
- GLP compliance:
- no
- Remarks:
- N.A.
- Dissociating properties:
- no
- Remarks on result:
- other: MMT does not dissociate
- Conclusions:
- Based on the structural formula of mmt it is not expected to dissociate.
Reference
Description of key information
mmt will not dissociate based on its structural formula. No dissociation constant can be calculated.
Key value for chemical safety assessment
Additional information
From its chemical formula it is clear that there are no functional acidic groups in mmt and it contains no H-bond donors or acceptors. There are no hydrogen atoms attached to oxygen in mmt and threfore if does not exhibit an acidic behaviour. Based on this data, dissociation will not occur under naturally relevant pH conditions. In addition, the substance is poorly soluble in water.
Typically, highly charged metal ions, such as Fe3+ or Cr3+ show acidic speciation in water, forming non-dissociated oxides and hydroxides, and resulting in acidic solutions. The higher a metal is charged, the bigger this effect. For Fe3+ and Cr3+ pKa values of 2.22 and 3.82 respectively are reported, whereas for Cu2+ and Zn2+ pKa values are 8.00 and 9.66 respectively. In mmt, where the manganese atom charge is +1 and the metal is surrounded by relatively large organic molecules this phenomenon does not play a role.
Although conceptually, mmt is described as containing Mn+ and Cyclopentadiene(Cp)-ions, in part to allow for the known aromatic character of the cyclopentadiene ring in mmt, the actual binding between ionic Mn and the Cp ring is not ionic in nature, consequently an aqueous solution of mmt does not contain ionic species.
As the carbonyl ligands in mmt have no acidic behavior, their binding to a mildly electrophylic atom does not change this behaviour.
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