{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.perchloromethylmercaptan","code":"thing-q680191","url":"https://ver.cy/models/thing/q680191/","name":"perchloromethylmercaptan","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":"Perchloromethylmercaptan is the organosulfur compound trichloromethanesulfenyl chloride, CCl₃SCl, a toxic sulfenyl chloride rather than a thiol despite its historical name.","purpose":"Enable an agent to recognise perchloromethylmercaptan, assess the identity and condition of a represented material, and determine which handling or use decisions require further evidence.","scope":{"in":["Chemical identity, structural distinctions, synonyms and verified identifiers","Purity, impurities and the relationship between the substance and a particular material lot","Physical properties with measurement conditions and decomposition qualifications","Moisture sensitivity, incompatible contacts and evidence of deterioration","Exposure assessment, hazard classifications and jurisdiction-specific handling constraints"],"out":["Manufacturing routes, synthesis recipes and production equipment","Complete formulations or products containing the substance","Downstream chemicals made using the substance","Facility ventilation and containment system design","Clinical diagnosis and treatment of exposed people","Operational emergency-response and waste-treatment procedures"],"boundaries":[]},"distinguishingFeatures":["Require structural agreement with CCl3-S-Cl, rather than accepting a name match alone; PubChem identifies perchloromethylmercaptan as trichloromethanesulfenyl chloride, CID 11666. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/11666)","Distinguish the sulfur-chlorine connectivity from an ordinary mercaptan containing sulfur-hydrogen; the historical name must not determine the functional-group classification.","Check CAS 594-42-3 against the stated chemical identity; acronyms such as PCM or PMM are insufficient identifiers. [NIOSH Pocket Guide](https://www.cdc.gov/niosh/npg/npgd0489.html)","Reject identification based only on a yellow liquid appearance or acrid odour; these observations do not establish molecular identity or purity.","Distinguish a characterised perchloromethylmercaptan lot from a formulation, contaminated sample or reacted residue containing some of the substance."],"structure":{"bundles":[{"id":"identity-and-material-boundary","name":"Identity and material boundary","description":"Establish what the historical substance name denotes and when a material record represents that substance.","layers":[{"id":"structure-and-names","name":"Structure and names","description":"Resolve names through molecular connectivity and authoritative identifiers.","findings":[{"id":"sulfenyl-chloride-identity","name":"Sulfenyl chloride identity","description":"Require CCl3-S-Cl connectivity and distinguish the historical mercaptan name from a sulfur-hydrogen functional group.","questions":[{"text":"Which structural record establishes that perchloromethylmercaptan denotes CCl3-S-Cl?","id":"sulfenyl-chloride-identity-q01","kind":"definition"},{"text":"Which source connects the supplier's exact name and identifier to that structure?","id":"sulfenyl-chloride-identity-q02","kind":"provenance"}]}]},{"id":"substance-versus-lot","name":"Substance versus lot","description":"Distinguish the registered chemical from mixtures and individual containers of material.","findings":[{"id":"represented-material-boundary","name":"Represented material boundary","description":"Record whether the subject is a substance specification, an assayed lot, a formulation or an altered residue.","questions":[{"text":"Does this record describe perchloromethylmercaptan itself or a mixture containing it?","id":"represented-material-boundary-q01","kind":"boundary"},{"text":"What compositional evidence supports linking the represented material to this registry entry?","id":"represented-material-boundary-q02","kind":"provenance"}]}]}]},{"id":"composition-and-integrity","name":"Composition and integrity","description":"Represent assay quality and changes that could invalidate a material's stated composition.","layers":[{"id":"assay-and-impurities","name":"Assay and impurities","description":"Capture evidence for the amount and chemical specificity of the reported substance.","findings":[{"id":"analytical-specificity","name":"Analytical specificity","description":"Require a quantitative assay that distinguishes the target from impurities and reaction products.","questions":[{"text":"What method measures perchloromethylmercaptan specifically, and which interferents were evaluated?","id":"analytical-specificity-q01","kind":"measurement"},{"text":"What assay basis, uncertainty and impurity reporting limits accompany the lot result?","id":"analytical-specificity-q02","kind":"measurement"}]}]},{"id":"integrity-over-time","name":"Integrity over time","description":"Connect composition confidence to storage history, moisture contact and retesting.","findings":[{"id":"deterioration-evidence","name":"Deterioration evidence","description":"Treat suspected moisture exposure or chemical change as a reason to reassess the lot's characterisation.","questions":[{"text":"What evidence records moisture exposure, containment failure or changes since the last assay?","id":"deterioration-evidence-q01","kind":"provenance"},{"text":"Which qualified acceptance criteria determine whether the lot requires retesting or restricted use?","id":"deterioration-evidence-q02","kind":"action"}]}]}]},{"id":"phase-and-thermal-behaviour","name":"Phase and thermal behaviour","description":"Capture physical properties without losing the conditions or reaction qualifications attached to them.","layers":[{"id":"phase-and-volatility","name":"Phase and volatility","description":"Represent phase, density and vapour pressure as conditional observations.","findings":[{"id":"conditioned-property-records","name":"Conditioned property records","description":"Require temperature, pressure, purity and measurement provenance wherever these affect interpretation.","questions":[{"text":"At what temperature and purity were the reported vapour pressure and density determined?","id":"conditioned-property-records-q01","kind":"measurement"},{"text":"Does the observed sample state agree with validated phase data under the recorded conditions?","id":"conditioned-property-records-q02","kind":"measurement"}]}]},{"id":"thermal-transition-interpretation","name":"Thermal transition interpretation","description":"Separate phase transitions from irreversible chemical change.","findings":[{"id":"boiling-versus-decomposition","name":"Boiling versus decomposition","description":"Preserve decomposition annotations and avoid inferring a stable operating range from a boiling-point entry.","questions":[{"text":"Does the reported boiling observation describe equilibrium vaporisation, decomposition or both?","id":"boiling-versus-decomposition-q01","kind":"definition"},{"text":"Which measurements establish freezing behaviour and thermal stability, with pressure and method stated?","id":"boiling-versus-decomposition-q02","kind":"measurement"}]}]}]},{"id":"reactivity-and-containment","name":"Reactivity and containment","description":"Connect chemical contact hazards to the suitability of a represented material's surroundings.","layers":[{"id":"water-contact","name":"Water contact","description":"Distinguish physical solubility information from evidence of reaction with water.","findings":[{"id":"reactive-water-boundary","name":"Reactive water boundary","description":"Do not interpret an insolubility entry as evidence that water contact leaves the substance unchanged.","questions":[{"text":"What evidence distinguishes dissolution measurements from hydrolysis or other chemical change?","id":"reactive-water-boundary-q01","kind":"boundary"},{"text":"Which authoritative assessment supports decisions about material with suspected water contact?","id":"reactive-water-boundary-q02","kind":"action"}]}]},{"id":"contact-materials","name":"Contact materials","description":"Assess actual wetted materials and adjacent chemicals against specific compatibility evidence.","findings":[{"id":"containment-compatibility","name":"Containment compatibility","description":"Require evidence for the proposed metal, lining, seal or other contact material under relevant conditions.","questions":[{"text":"Which compatibility evidence covers the exact contact material, temperature and duration?","id":"containment-compatibility-q01","kind":"provenance"},{"text":"Does any proposed contact involve a documented incompatible substance or an unassessed material?","id":"containment-compatibility-q02","kind":"action"}]}]}]},{"id":"exposure-and-applicable-controls","name":"Exposure and applicable controls","description":"Represent exposure evidence and the authoritative constraints governing a proposed activity.","layers":[{"id":"exposure-evidence","name":"Exposure evidence","description":"Keep measured concentrations, analytical limitations and benchmark purposes distinct.","findings":[{"id":"measurement-and-benchmark-fit","name":"Measurement and benchmark fit","description":"Require a justified sampling method and a benchmark matched by units, duration and purpose; odour is not a quantitative measurement.","questions":[{"text":"What validated method can quantify airborne perchloromethylmercaptan at the concentration relevant to the assessment?","id":"measurement-and-benchmark-fit-q01","kind":"measurement"},{"text":"Is the comparison value a workplace time-weighted limit or an emergency benchmark, and what authority and date support it?","id":"measurement-and-benchmark-fit-q02","kind":"provenance"},{"text":"Do analytical uncertainty and detection limits permit the proposed exposure conclusion?","id":"measurement-and-benchmark-fit-q03","kind":"action"}]}]},{"id":"jurisdiction-and-activity","name":"Jurisdiction and activity","description":"Resolve classifications and obligations for the actual material and intended activity.","findings":[{"id":"applicable-classification","name":"Applicable classification","description":"Attach GHS, transport and other regulatory determinations to their jurisdiction, version and material scope.","questions":[{"text":"Which current authoritative records establish the EC identity, GHS classification and transport designation?","id":"applicable-classification-q01","kind":"provenance"},{"text":"Do those determinations apply to the pure substance, the represented grade or a separately classified mixture?","id":"applicable-classification-q02","kind":"boundary"},{"text":"What documented conditions must be satisfied before the intended storage, transfer, use or disposal is authorised?","id":"applicable-classification-q03","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 perchloromethylmercaptan 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 perchloromethylmercaptan this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of perchloromethylmercaptan this model covers, and on what evidence?","id":"evidence-real-world-use-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 perchloromethylmercaptan this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of perchloromethylmercaptan this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-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 perchloromethylmercaptan this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Identify perchloromethylmercaptan from labels, identifiers and safety data sheets.","Report its classification and hazards from official sources.","Flag a leaking or unlabelled container for emergency response."],"mustNot":["Assist in making, obtaining or using it to harm people or animals.","Give procedures for synthesis, release or dispersal.","Handle, open or transport it outside licensed facilities with trained people.","Dispose of it in drains, soil, water or ordinary waste."],"requiresHuman":["Responding to a spill or release.","Transferring stocks to another holder."]},"ethics":{"considerations":["Toxic industrial chemicals can harm workers and nearby communities if controls fail.","Information that eases misuse must not be spread."],"affectedParties":["Workers handling it","Nearby communities","Emergency responders"]},"owners":{"steward":"The licensed operator who holds it; chemical safety authorities regulate it.","roles":[],"masterSystems":[]},"relations":[{"target":"Q11173","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.perchloromethylmercaptan","Wikidata: Q680191 (https://www.wikidata.org/wiki/Q680191)"]},"properties":{"applicability":"required","items":["Chemical identity: CCl3-S-Cl; CAS 594-42-3; identifiers cross-checked against structure","Registry and identifier correspondence: vr.tr.perchloromethylmercaptan linked to verified CAS, PubChem and EC records","Assay and impurity profile: Mass fraction or mass %, with analytical method, uncertainty and named impurities","Physical state: Observed phase and appearance at recorded temperature in °C and pressure in kPa","Thermal transitions and decomposition: °C at stated pressure; melting, freezing, boiling and decomposition distinguished","Vapour pressure and density: Pa or kPa; kg/m³; temperature and measurement basis required","Moisture exposure and chemical integrity: Exposure unknown, no exposure documented, suspected exposure or analytically confirmed change","Contact compatibility: Substance-to-material or substance-to-reagent assessment, with conditions and evidence","Airborne concentration: ppm or mg/m³ with sampling duration, method, detection limit and conversion conditions","Hazard and regulatory status: GHS classification, exposure benchmarks and transport identity by authority, jurisdiction and date"]},"recognition":{"applicability":"required","items":["Identity rests on labels, transport placards and analysis, not appearance.","Its old name suggests a thiol, but it is a sulfenyl chloride, so names must be checked."]},"capabilities":{"applicability":"required","items":["Resolve a supplier label or synonym to the registered substance using structural and identifier evidence.","Assess whether a lot's assay, impurity profile and history support a specified intended use.","Flag missing conditions or decomposition qualifications in reported physical properties.","Screen a proposed contact material against documented compatibility evidence.","Compare a measured airborne concentration with an applicable benchmark using matched units and averaging periods.","Refer material with uncertain identity, moisture exposure or deterioration for qualified review."]},"hazards":{"applicability":"required","items":["Toxic and corrosive to the eyes, skin and lungs.","Releases harmful products when it reacts or burns.","Leaks endanger workers, responders and neighbours."]},"interfaces":{"applicability":"required","items":["Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations."]},"context":{"applicability":"required","items":["Perchloromethylmercaptan is encountered as a specialized chemical intermediate in industrial organosulfur synthesis, including the manufacture of certain pesticides.","It also appears in chemical inventories, toxicology references and environmental assessments where its historical name must be distinguished from its sulfenyl chloride identity."]}},"sources":[{"title":"Wikidata item Q680191: perchloromethylmercaptan","url":"https://www.wikidata.org/wiki/Q680191","note":"identity and sense of the item"},{"title":"Wikipedia: Trichloromethane sulfenyl chloride","url":"https://en.wikipedia.org/wiki/Trichloromethane_sulfenyl_chloride","note":"general description of the item"}],"openQuestions":["Which authoritative EC record and current jurisdiction-specific GHS and transport classifications resolve the substance's complete regulatory identity?","What primary measurements establish melting or freezing behaviour and reconcile boiling observations with decomposition?","What validated analytical methods can distinguish perchloromethylmercaptan from relevant impurities and quantify airborne concentrations at applicable assessment levels?","Which impurity, moisture and storage-history criteria reliably determine lot integrity and fitness for a specified use?","What condition-specific evidence establishes compatibility with candidate container materials and the consequences of moisture exposure?"],"resources":{"spec":"/models/things/publications/thing-q680191/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q680191/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T12:00:03Z","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 2026-10-07T10:10:32+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}