{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.chromium-tetrafluoride","code":"thing-q1087524","url":"https://ver.cy/models/thing/q1087524/","name":"chromium tetrafluoride","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Chromium tetrafluoride is a binary inorganic compound with formula CrF4, in which chromium has the formal oxidation state +4.","purpose":"Enable an agent to recognise chromium tetrafluoride, assess the identity and condition of a specimen, and determine whether evidence supports its proposed handling or use.","scope":{"in":["CrF4 identity, chromium(IV) assignment and verified chemical identifiers","Specimen purity, grade and other chromium-containing phases","Phase-specific structure and analytical identification","Physical properties with measurement conditions and uncertainty","Chemical alteration, compatibility and storage condition","Substance-specific hazard evidence and applicable regulatory identity"],"out":["Other chromium fluorides as independently modelled substances","Fluorochromate salts, adducts and oxygen-containing chromium fluorides","Products and mixtures containing chromium tetrafluoride","Synthesis processes and fluorination equipment","Laboratory operating procedures and emergency-response systems","General chromium toxicology without demonstrated applicability to CrF4"],"boundaries":[]},"distinguishingFeatures":["Require the neutral binary composition CrF4: a Cr:F atomic ratio of 1:4 alone cannot exclude a mixture.","Assign formal chromium oxidation state +4 from neutral CrF4 stoichiometry, and seek analytical support where mixed oxidation states are plausible.","Exclude oxygen-bearing compounds and counterion-containing fluorochromate salts even when their names include chromium and tetrafluoride.","Cross-check CAS 10049-11-3 against formula and substance name; NIST associates this identifier with CrF4. [NIST Chemistry WebBook](https://webbook.nist.gov/cgi/cbook.cgi?ID=C10049113&Mask=40)","Distinguish solid-state connectivity from isolated-species geometry: published solid-state spectroscopy supports fluorine-bridged polymeric CrF4 rather than identifying every specimen as discrete four-coordinate molecules. [RSC spectroscopic study](https://pubs.rsc.org/en/content/articlelanding/1985/dt/dt9850001443)"],"structure":{"bundles":[{"id":"crf4-identity-and-boundaries","name":"CrF4 identity and boundaries","description":"Establishes which chemical entity the registry entry denotes.","layers":[{"id":"composition-and-charge","name":"Composition and charge","description":"Tests the binary formula and neutral-substance interpretation.","findings":[{"id":"neutral-crf4-assignment","name":"Neutral CrF4 assignment","description":"Record formula, charge and the resulting formal chromium oxidation state together; formula alone does not establish specimen purity.","questions":[{"text":"Does chromium tetrafluoride here denote neutral CrF4 with formal chromium(IV)?","id":"neutral-crf4-assignment-q01","kind":"definition"},{"text":"What evidence excludes an oxygen-bearing compound, a charged complex or a mixture with the same average Cr:F ratio?","id":"neutral-crf4-assignment-q02","kind":"boundary"}]}]},{"id":"identifier-resolution","name":"Identifier resolution","description":"Connects registry identity to independently checked chemical records.","findings":[{"id":"verified-identifier-mapping","name":"Verified identifier mapping","description":"NIST lists CrF4 under CAS 10049-11-3; other identifier mappings require their own verification. [NIST Chemistry WebBook](https://webbook.nist.gov/cgi/cbook.cgi?ID=C10049113&Mask=40)","questions":[{"text":"Which authoritative record verifies each CAS, PubChem or EC identifier attached to this entry?","id":"verified-identifier-mapping-q01","kind":"provenance"},{"text":"Does a linked record represent the bulk substance, an isolated molecular representation or a different charged species?","id":"verified-identifier-mapping-q02","kind":"boundary"}]}]}]},{"id":"specimen-composition-and-grade","name":"Specimen composition and grade","description":"Determines how closely a physical specimen corresponds to the CrF4 identity.","layers":[{"id":"assay-and-speciation","name":"Assay and speciation","description":"Separates total elemental composition from compound and oxidation-state fractions.","findings":[{"id":"crf4-content-evidence","name":"CrF4 content evidence","description":"Record the assay basis and evidence distinguishing CrF4 from other chromium fluoride components.","questions":[{"text":"What fraction of the specimen is assigned to CrF4, and how was that fraction measured?","id":"crf4-content-evidence-q01","kind":"measurement"},{"text":"Can the analytical method distinguish chromium(IV) material from mixtures of other chromium oxidation states?","id":"crf4-content-evidence-q02","kind":"measurement"}]}]},{"id":"impurities-and-acceptance","name":"Impurities and acceptance","description":"Relates preparation residues and alteration products to a declared grade.","findings":[{"id":"use-specific-purity","name":"Use-specific purity","description":"Treat grade as an explicit acceptance specification covering relevant chromium fluorides, oxygen-bearing contaminants and residual preparation materials.","questions":[{"text":"Which impurities were sought, at what detection limits, and which remain unmeasured?","id":"use-specific-purity-q01","kind":"measurement"},{"text":"What impurity and CrF4-content limits must this specimen meet for the proposed use?","id":"use-specific-purity-q02","kind":"action"}]}]}]},{"id":"phase-structure-and-properties","name":"Phase, structure and properties","description":"Connects CrF4 structural assignments and physical measurements to their experimental environment.","layers":[{"id":"structural-identification","name":"Structural identification","description":"Assesses connectivity and analytical fingerprints for the observed phase.","findings":[{"id":"phase-qualified-connectivity","name":"Phase-qualified connectivity","description":"Solid-state infrared and ultraviolet-visible spectroscopy has been interpreted as supporting fluorine-bridged polymeric CrF4; record the evidential basis of any more specific structural assignment. [RSC spectroscopic study](https://pubs.rsc.org/en/content/articlelanding/1985/dt/dt9850001443)","questions":[{"text":"Does the structural evidence concern bulk solid CrF4, vapour, a matrix-isolated species or a calculation?","id":"phase-qualified-connectivity-q01","kind":"boundary"},{"text":"Which diffraction or spectroscopic observations support the specimen's assigned chromium coordination and fluoride connectivity?","id":"phase-qualified-connectivity-q02","kind":"measurement"}]}]},{"id":"conditioned-property-values","name":"Conditioned property values","description":"Preserves the conditions and interpretation of physical measurements.","findings":[{"id":"thermal-event-identification","name":"Thermal event identification","description":"Require evidence that a reported transition belongs to chemically identified CrF4 and distinguish phase change from chemical change.","questions":[{"text":"Is each reported thermal event melting, boiling, sublimation, a solid-state transition or decomposition?","id":"thermal-event-identification-q01","kind":"measurement"},{"text":"What pressure, atmosphere, specimen purity and measurement method accompany the value?","id":"thermal-event-identification-q02","kind":"provenance"}]}]}]},{"id":"chemical-change-and-compatibility","name":"Chemical change and compatibility","description":"Tracks whether exposure or contact changes the substance represented by the specimen.","layers":[{"id":"exposure-and-reassessment","name":"Exposure and reassessment","description":"Relates environmental history to the continuing validity of CrF4 characterisation.","findings":[{"id":"alteration-evidence","name":"Alteration evidence","description":"Record moisture, atmosphere and thermal exposure alongside observations and analyses; establish actual alteration products rather than assuming them.","questions":[{"text":"What air, moisture or temperature exposure occurred since the specimen was characterised?","id":"alteration-evidence-q01","kind":"provenance"},{"text":"What analytical evidence establishes whether CrF4 remains present or has formed other chromium species?","id":"alteration-evidence-q02","kind":"measurement"},{"text":"Which exposure or analytical change requires reassessment before further use?","id":"alteration-evidence-q03","kind":"action"}]}]},{"id":"contact-and-reaction-boundaries","name":"Contact and reaction boundaries","description":"Records supported interactions with contact materials and reaction partners.","findings":[{"id":"documented-compatibility","name":"Documented compatibility","description":"Qualify compatibility by contact material and conditions, and distinguish unchanged CrF4 from salts, adducts or reaction products.","questions":[{"text":"Which evidence supports compatibility with the proposed vessel, seal, atmosphere or medium at the intended conditions?","id":"documented-compatibility-q01","kind":"provenance"},{"text":"Would the proposed interaction preserve CrF4 identity or produce a substance requiring a separate model?","id":"documented-compatibility-q02","kind":"boundary"}]}]}]},{"id":"hazard-evidence-and-action-constraints","name":"Hazard evidence and action constraints","description":"Connects CrF4-specific safety evidence and jurisdictional requirements to proposed actions.","layers":[{"id":"classification-applicability","name":"Classification applicability","description":"Checks that hazard statements and exposure limits apply to the identified substance or an explicitly relevant category.","findings":[{"id":"crf4-hazard-record","name":"CrF4 hazard record","description":"Keep documented classification, broader-category applicability and missing evidence distinct.","questions":[{"text":"Which current safety document or regulatory record explicitly covers CrF4 under the verified identifier?","id":"crf4-hazard-record-q01","kind":"provenance"},{"text":"Does each exposure limit apply to CrF4, a defined chromium category, fluoride, or a separately identified reaction product?","id":"crf4-hazard-record-q02","kind":"boundary"}]}]},{"id":"operation-eligibility","name":"Operation eligibility","description":"Uses identity, condition and documented controls to assess proposed handling.","findings":[{"id":"supported-handling-decision","name":"Supported handling decision","description":"Record whether a proposed transfer, storage, analysis or disposal action is supported by applicable evidence and an approved procedure.","questions":[{"text":"Do the specimen's confirmed composition and condition fall within the proposed procedure's permitted material scope?","id":"supported-handling-decision-q01","kind":"action"},{"text":"Which unresolved identity, compatibility or hazard question prevents authorising this action?","id":"supported-handling-decision-q02","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of chromium tetrafluoride this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of chromium tetrafluoride this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of chromium tetrafluoride this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of chromium tetrafluoride this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Explain chromium tetrafluoride as a chromium(IV) fluoride and its place in fluorine chemistry.","Report hazards and handling rules from safety data sheets and literature."],"mustNot":["Handle it outside a specialist laboratory equipped for reactive fluorides.","Release it or its decomposition products into air, water or drains.","Provide preparation procedures to people outside a supervised laboratory.","Present it as harmless because quantities are small."],"requiresHuman":["Approving storage, transfer or disposal of reactive fluorine compounds."]},"ethics":{"considerations":["Reactive fluorides and chromium compounds can injure workers severely.","Hazardous waste must not burden communities near disposal sites."],"affectedParties":["Laboratory workers","Waste handlers","Emergency responders"]},"owners":{"steward":"The laboratory or business that holds it; chemical safety authorities regulate supply and use.","roles":[],"masterSystems":[]},"relations":[{"target":"Q11173","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.chromium-tetrafluoride","Wikidata: Q1087524 (https://www.wikidata.org/wiki/Q1087524)"]},"properties":{"applicability":"required","items":["Chemical identity: CrF4; chromium tetrafluoride; chromium(IV) fluoride","Identifier correspondence: Registry vr.tr.chromium-tetrafluoride; CAS 10049-11-3; independently verified PubChem and EC mappings","Chromium oxidation-state distribution: Formal target +4; measured fractions by oxidation state with method and uncertainty","CrF4 assay and grade: Mass fraction or molar fraction with stated basis, analytical method and grade specification","Impurity profile: Other chromium fluorides, oxygen-bearing species, water and preparation residues in mass percent or mg/kg","Phase and structural assignment: Observed phase, crystallinity, coordination and connectivity at recorded temperature, pressure and environment","Identification signatures: Diffraction data; vibrational bands in cm^-1; electronic bands in nm or eV; method-specific uncertainty","Thermal and transport properties: Transition temperature in K, pressure in Pa, density in kg/m^3 and vapour pressure in Pa, each with conditions","Exposure and alteration status: As-characterised, exposed, suspected altered or confirmed altered; atmosphere, moisture, temperature and duration recorded","Hazard and permission evidence: CrF4-specific safety documents, classifications, exposure-limit scope, jurisdiction, date and approved-use conditions"]},"recognition":{"applicability":"required","items":["Identified by container label, chemical name and identifier, and certificate of analysis rather than by appearance alone."]},"capabilities":{"applicability":"required","items":["Resolve a labelled specimen to CrF4 or flag its identity as unconfirmed.","Compare analytical results with phase-appropriate CrF4 references and identify contradictory evidence.","Assess whether measured purity and condition meet a stated use requirement.","Flag specimens for reassessment after exposure or unexplained property changes.","Retrieve documented compatibility and handling constraints for a proposed operation.","Separate supported CrF4 property values from estimates, calculations and values belonging to neighbouring compounds."]},"hazards":{"applicability":"required","items":["Release of hydrogen fluoride on contact with moisture.","Corrosive burns.","Toxicity of chromium compounds."]},"interfaces":{"applicability":"required","items":["Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations."]},"context":{"applicability":"required","items":["This compound is encountered in specialist inorganic chemistry research on chromium fluorides and higher oxidation states.","It is studied to understand chromium-fluorine bonding, chemical reactivity and relationships among chromium fluoride compounds."]}},"sources":[{"title":"Wikidata item Q1087524: chromium tetrafluoride","url":"https://www.wikidata.org/wiki/Q1087524","note":"identity and sense of the item"},{"title":"Wikipedia: Chromium(IV) fluoride","url":"https://en.wikipedia.org/wiki/Chromium%28IV%29_fluoride","note":"general description of the item"}],"openQuestions":["Which PubChem representation and EC identifier, if any, correspond unambiguously to the registered bulk CrF4 substance?","Which primary crystallographic studies establish solid CrF4 coordination, connectivity and any distinct structural forms?","What reliable measurements distinguish CrF4 melting, sublimation, boiling and decomposition, and what density or vapour-pressure data are available under specified conditions?","What experimentally established moisture, thermal and contact-material compatibility limits apply to CrF4, and which alteration products have been identified?","Which current CrF4-specific hazard classifications, exposure-limit interpretations and jurisdictional handling requirements are supported by authoritative records?"],"resources":{"spec":"/models/things/publications/thing-q1087524/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1087524/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T08:41:39Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:25+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}