dimethylcadmium
Enable an agent to recognise dimethylcadmium, assess the identity and condition of a particular sample, and determine which decisions require verified chemical, safety or regulatory evidence.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 18 findings · 34 questions
Molecular identity Establishes which chemical entity the dimethylcadmium entry denotes.
Structure and names
Connects the registered name to its molecular structure and accepted naming variants.
Two-methyl cadmium identity
Record the evidence supporting assignment to Cd(CH3)2 rather than another cadmium species.
- Which authoritative identity record establishes dimethylcadmium as Cd(CH3)2? definition
- Which structural or analytical evidence distinguishes this sample from other dialkylcadmium compounds? boundary
Identifier reconciliation
Resolves external identifiers against the substance rather than against a containing product.
Verified chemical crosswalk
Maintain sourced mappings between the Vercy entry and applicable chemical registries.
- Which CAS number, PubChem CID and EC identifier can be verified for this exact substance? provenance
- Does each linked record denote dimethylcadmium itself, a solution or a supplier-specific product? boundary
Sample composition and integrity Describes how an actual sample differs from the ideal molecular substance.
Grade and assay
Records declared grade alongside measured composition and analytical limitations.
Dimethylcadmium content
Separate compound-specific assay from total cadmium measurement and supplier grade labels.
- What fraction of the sample is established as dimethylcadmium, and on what concentration basis? measurement
- Does the analytical method identify intact dimethylcadmium or measure cadmium regardless of chemical species? boundary
- Which solvent and impurities are identified, with what detection limits? measurement
Composition over time
Connects current sample integrity to dated observations and relevant exposure history.
Chemical alteration evidence
Record suspected or verified composition changes without assigning unmeasured reaction products.
- What evidence establishes whether dimethylcadmium remains present at the previously reported assay? measurement
- Which recorded air, moisture or thermal exposures make reassessment necessary according to a verified source? provenance
- When does uncertainty about current composition prevent reliance on the original certificate of analysis? action
Physical state and volatility Organises condition-dependent physical data for neat dimethylcadmium and identified samples.
Phase boundaries
Qualifies phase observations and transition data by sample composition and conditions.
Qualified phase data
Record melting, boiling and observed phase only with their experimental context.
- What melting and boiling temperatures are supported by readable sources, and at what pressures? measurement
- Does each transition report concern neat dimethylcadmium, and does it distinguish phase change from decomposition? boundary
Vapour and bulk properties
Captures measurements needed to interpret the behaviour of a specified quantity under stated conditions.
Conditioned property evidence
Retain temperature-dependent vapour pressure and density data with applicability limits.
- What measured vapour-pressure data or validated correlations exist for dimethylcadmium, and over which temperature range? measurement
- What density value applies to the stated phase, temperature and composition? measurement
- Which proposed comparisons or calculations would extrapolate beyond the source's validated conditions? boundary
Toxicity and reactivity evidence Separates health hazards from ignition and chemical-reactivity hazards while preserving evidence scope.
Health hazard basis
Tracks exposure routes, reported effects and the chemical scope of supporting evidence.
Compound-specific toxicology
Distinguish findings about dimethylcadmium from findings about cadmium or other cadmium compounds.
- Which acute and chronic health effects are directly supported for dimethylcadmium, and for which exposure routes? provenance
- Which hazard conclusions rely on cadmium-group classification or read-across rather than direct dimethylcadmium evidence? boundary
Ignition and incompatibility
Records supported ignition, air-reactivity, water-reactivity and incompatibility claims.
Reactivity decision constraints
Connect each reactivity claim to a source, sample form and documented consequence for permissible actions.
- Which authoritative sources establish ignition behaviour and reactions with air or water for the relevant sample form? provenance
- Which contact materials or co-stored chemicals are identified as incompatible, and under what conditions? boundary
- Which proposed actions require a qualified safety review because the applicable reactivity evidence is missing or conflicting? action
Regulatory applicability and disposition Links chemical identity and sample form to current classifications and activity-specific requirements.
Classification and exposure limits
Makes jurisdiction, effective date and concentration basis explicit.
Applicable hazard and limit records
Record verified classifications and occupational limits without treating them as globally interchangeable.
- What hazard classification applies under the named jurisdiction and revision, and is it harmonised or supplier-assigned? provenance
- Does the applicable exposure limit cover dimethylcadmium specifically or a broader cadmium category? boundary
- What units, averaging period, airborne fraction and cadmium-versus-compound mass basis define that limit? measurement
Use, transfer and disposition
Relates contemplated activities to verified requirements for the actual substance or mixture.
Activity-specific eligibility
Establish whether sufficient evidence exists to assess a proposed use, transfer or waste disposition.
- Which current restrictions and transport or waste classifications apply to this sample form in the relevant jurisdictions? provenance
- What composition and identity information must be resolved before the proposed activity can be assessed? action
- Which requirements attach to dimethylcadmium itself and which attach to the containing product or resulting waste? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of dimethylcadmium this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of dimethylcadmium this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these standards and regulation hold for the sense of dimethylcadmium this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of dimethylcadmium this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these typical measurements hold for the sense of dimethylcadmium this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of dimethylcadmium this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these regional variation hold for the sense of dimethylcadmium this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of dimethylcadmium this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
What it is Filled
Dimethylcadmium is an organocadmium compound with formula Cd(CH3)2, containing cadmium in the formal +2 oxidation state bonded to two methyl groups, and occurring as a volatile, highly toxic, air-sensitive liquid near room temperature.
In scope
- Molecular identity of Cd(CH3)2 and verified chemical identifiers
- Grade, assay, impurities and changes in sample composition
- Physical state and measured properties with temperature, pressure and provenance
- Evidence concerning toxicity, volatility, ignition and chemical incompatibility
- Jurisdiction-specific classification, exposure controls and disposition requirements
Out of scope
- Manufacturing and synthesis procedures
- Commercial formulation, packaging and supplier-product models beyond their relation to the substance
- Equipment design and operational recipes for processes using dimethylcadmium
- Other organocadmium compounds, cadmium metal and inorganic cadmium compounds
- Clinical diagnosis or treatment of an exposed person
Why it exists Filled
Enable an agent to recognise dimethylcadmium, assess the identity and condition of a particular sample, and determine which decisions require verified chemical, safety or regulatory evidence.
Distinguishing features Filled
- The assigned molecular structure must contain one cadmium atom bonded to two methyl groups; a cadmium-containing sample alone does not establish dimethylcadmium identity.
- The molecular formula C2H6Cd must agree with the structural assignment and identifiers; formula matching alone is insufficient verification.
- Dimethylcadmium must be distinguished from other dialkylcadmium compounds by the identity of both organic groups.
- A solution containing dimethylcadmium must identify its solvent and concentration rather than inherit the properties of the neat substance.
- A degraded sample must retain a distinction between originally supplied dimethylcadmium and its currently established composition.
What robots and AI may and may not do Filled
Must not
- Handle it outside a specialist facility with containment for toxic, air-sensitive liquids.
- Provide preparation, handling or use procedures to people outside such a facility.
- Release it or cadmium waste into air, water or drains.
- Recommend it where safer precursors are available without stating its hazards.
Only with a human decision
- Approving purchase, transfer or disposal of the compound.
May
- Explain dimethylcadmium's historical role as a precursor for semiconductor materials in general terms.
- Report its severe hazards and the need for specialist containment from safety data sheets.
Moral aspects Filled
- Dimethylcadmium is among the most toxic laboratory chemicals; exposure can be fatal or cause cancer.
- Cadmium contamination persists and harms communities and ecosystems.
Who is affected
- Laboratory and fab workers
- Emergency responders
- Communities near disposal sites
Owners Filled
Steward
The laboratory or business that holds it; chemical safety authorities regulate supply and use.
Links to other meta-models Filled
parent
- Q11173 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.dimethylcadmium
- Wikidata: Q27237219 (https://www.wikidata.org/wiki/Q27237219)
Direct properties required Filled
- Molecular identity: Cd(CH3)2; C2H6Cd; verified structure and synonyms
- Registry identifier mapping: vr.tr.dimethylcadmium linked to verified CAS, PubChem and EC records where available
- Sample form: Neat substance, solution, mixture or composition unresolved
- Assay and impurity profile: Mass fraction, mole fraction or concentration with basis, analytical method and uncertainty
- Physical state: Observed phase with temperature in K or °C and pressure in Pa or kPa
- Phase-transition properties: Melting and boiling temperatures in K or °C, with pressure and any reported decomposition
- Vapour pressure: Pa or kPa at a specified temperature, with method and source
- Sample integrity: Verified unchanged, suspected altered, confirmed altered or unknown; dated evidence required
- Hazard classification: Verified hazard classes, categories and statements under a named classification system and revision
- Exposure-limit applicability: Limit record with jurisdiction, chemical scope, airborne fraction, averaging period and concentration basis
Recognition required Filled
- Identified by container label, chemical name and identifier, and certificate of analysis rather than by appearance alone.
Capabilities and actions required Filled
- Reconcile a supplier label or analytical record with the registered molecular identity.
- Assess whether a sample's grade, composition and evidence meet a declared application requirement.
- Compare physical-property reports after aligning sample form, temperature, pressure and measurement basis.
- Flag missing or contradictory evidence that prevents a handling or use decision.
- Determine which verified substance-specific and cadmium-wide requirements apply to a stated jurisdiction and activity.
Hazards and failure modes required Filled
- Acute and chronic cadmium poisoning.
- Fire on contact with air.
- Long-term cancer risk from exposure.
Standards and interfaces required Filled
- Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations.
Context of use required Filled
- Dimethylcadmium is encountered in specialized organometallic research and historical chemical synthesis literature.
- It has served as a methylating reagent and as a precursor for cadmium-containing semiconductor materials, with its extreme toxicity restricting its practical use.
Sources Filled
- Wikidata item Q27237219: dimethylcadmium - identity and sense of the item
- Wikipedia: Dimethylcadmium - general description of the item
Open questions
- Which authoritative records verify the CAS, PubChem and EC mappings, and does an existing Vercy world model already cover this exact substance?
- Which primary measurements provide reliable melting point, boiling point, density and vapour-pressure data, including pressure, purity and decomposition qualifications?
- How much of the available toxicological evidence is specific to dimethylcadmium rather than extrapolated from other cadmium compounds?
- Which verified sources establish air, water and thermal reactivity, and how does their applicability change between neat material and solutions?
- Which current jurisdiction-specific classifications, exposure limits, transport requirements and restrictions apply, and are concentrations expressed as cadmium or as dimethylcadmium?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q27237219/spec.json