{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.methylcyclopentadienyl-manganese-tricarbonyl","code":"thing-q158568","url":"https://ver.cy/models/thing/q158568/","name":"methylcyclopentadienyl manganese tricarbonyl","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":"Methylcyclopentadienyl manganese tricarbonyl (MMT) is an organomanganese compound, C9H7MnO3, in which manganese is coordinated to an η5-methylcyclopentadienyl ligand and three carbonyl ligands, used principally as a gasoline antiknock additive.","purpose":"Enable an agent to recognise methylcyclopentadienyl manganese tricarbonyl, assess the condition and composition of a sample, and determine which handling or use decisions require further evidence.","scope":{"in":["Molecular identity and reconciliation of MMT names and chemical identifiers","Purity, grade, impurities and distinction between neat MMT and formulated mixtures","Physical properties with measurement conditions and sample provenance","Light exposure, decomposition and evidence of retained chemical identity","Substance-specific exposure assessment and jurisdiction-dependent use constraints"],"out":["Complete specifications of gasoline and commercial additive products containing MMT","Manufacturing plant design and synthesis operating procedures","Engine design, fuel certification and vehicle emissions performance","Clinical diagnosis and treatment of manganese exposure","Independent models of inorganic manganese compounds and combustion residues"],"boundaries":[]},"distinguishingFeatures":["Match the substance to CAS 12108-13-3 and formula CH3C5H4Mn(CO)3; an abbreviation alone does not establish identity. [NIOSH identity record](https://www.cdc.gov/niosh/npg/npgd0409.html)","Confirm a methyl-substituted cyclopentadienyl ligand and three carbonyl ligands around manganese; distinguish the unmethylated cyclopentadienyl analogue. [ATSDR structural reference](https://stacks.cdc.gov/view/cdc/5167/cdc_5167_DS1.pdf)","Require evidence for intact MMT: measuring total manganese alone cannot distinguish it from other manganese-bearing substances.","Distinguish a neat-substance sample from a solvent concentrate or treated fuel by constituent identities and concentration basis.","Treat colour and physical phase as supporting observations rather than sufficient identification tests."],"structure":{"bundles":[{"id":"mmt-chemical-identity","name":"MMT chemical identity","description":"Establish the chemical entity behind the registry name and distinguish close analogues.","layers":[{"id":"molecular-recognition","name":"Molecular recognition","description":"Identify the ligand composition and manganese-containing molecular entity.","findings":[{"id":"methylated-tricarbonyl-identity","name":"Methylated tricarbonyl identity","description":"Require structural evidence that distinguishes MMT from the unmethylated analogue and other manganese carbonyls.","questions":[{"text":"Which structural representation establishes the methylcyclopentadienyl ligand and three carbonyl ligands?","id":"methylated-tricarbonyl-identity-q01","kind":"definition"},{"text":"Which analytical evidence distinguishes the sample from cyclopentadienyl manganese tricarbonyl?","id":"methylated-tricarbonyl-identity-q02","kind":"boundary"}]}]},{"id":"identifier-alignment","name":"Identifier alignment","description":"Resolve synonyms and external records without creating duplicate substance identities.","findings":[{"id":"structure-backed-crosswalk","name":"Structure-backed crosswalk","description":"Map CAS, EC and PubChem identifiers only after checking their chemical scope and representation.","questions":[{"text":"Which authoritative records connect CAS 12108-13-3 to the registry entry?","id":"structure-backed-crosswalk-q01","kind":"provenance"},{"text":"Do candidate PubChem records describe equivalent coordination representations or chemically distinct entities?","id":"structure-backed-crosswalk-q02","kind":"boundary"}]}]}]},{"id":"assay-and-formulation-boundary","name":"Assay and formulation boundary","description":"Characterise MMT quantity and quality without confusing the substance with its carrier or product.","layers":[{"id":"sample-composition","name":"Sample composition","description":"Record intact MMT, impurities and intentional carriers separately.","findings":[{"id":"grade-and-constituent-evidence","name":"Grade and constituent evidence","description":"Connect sample acceptance to measured composition and a traceable specification.","questions":[{"text":"What mass fraction is intact MMT, and which method establishes that assay?","id":"grade-and-constituent-evidence-q01","kind":"measurement"},{"text":"Which non-MMT constituents are intentional carriers, impurities or suspected degradation products?","id":"grade-and-constituent-evidence-q02","kind":"boundary"}]}]},{"id":"manganese-reporting-basis","name":"Manganese reporting basis","description":"Make MMT-to-manganese comparisons explicit and auditable.","findings":[{"id":"concentration-basis-reconciliation","name":"Concentration basis reconciliation","description":"Separate total elemental manganese from molecular MMT concentration.","questions":[{"text":"Is the reported concentration expressed as MMT or as Mn, and per mass or volume of which material?","id":"concentration-basis-reconciliation-q01","kind":"measurement"},{"text":"Do other manganese species prevent total manganese from being used to infer intact MMT content?","id":"concentration-basis-reconciliation-q02","kind":"boundary"}]}]}]},{"id":"physical-state-and-integrity","name":"Physical state and integrity","description":"Assess condition-dependent properties and whether stored material retains its identity.","layers":[{"id":"conditioned-property-record","name":"Conditioned property record","description":"Attach temperature, pressure, composition and method to physical measurements.","findings":[{"id":"phase-and-property-consistency","name":"Phase and property consistency","description":"Compare observed phase and measured properties with evidence appropriate to the sample.","questions":[{"text":"What phase does the sample exhibit at its recorded temperature, pressure and composition?","id":"phase-and-property-consistency-q01","kind":"measurement"},{"text":"Which verified sources establish melting/freezing point, boiling point, density and vapour pressure with their conditions?","id":"phase-and-property-consistency-q02","kind":"provenance"}]}]},{"id":"storage-and-transformation","name":"Storage and transformation","description":"Relate exposure history to evidence of chemical change.","findings":[{"id":"light-history-and-requalification","name":"Light history and requalification","description":"Use storage history and analysis to decide whether MMT quality remains established.","questions":[{"text":"What light exposure, temperature history and container protection are documented for the sample?","id":"light-history-and-requalification-q01","kind":"provenance"},{"text":"Which analytical acceptance criteria require requalification after suspected decomposition?","id":"light-history-and-requalification-q02","kind":"action"}]}]}]},{"id":"mmt-exposure-and-handling","name":"MMT exposure and handling","description":"Connect substance-specific hazards to exposure evidence and handling decisions.","layers":[{"id":"route-specific-exposure","name":"Route-specific exposure","description":"Assess airborne exposure and skin contact using applicable evidence.","findings":[{"id":"exposure-benchmark-fit","name":"Exposure benchmark fit","description":"NIOSH lists a 0.2 mg/m³ TWA recommendation, expressed as Mn, with a skin notation. [NIOSH exposure record](https://www.cdc.gov/niosh/npg/npgd0409.html)","questions":[{"text":"Which current benchmark applies, with what mass basis, averaging period and legal or advisory status?","id":"exposure-benchmark-fit-q01","kind":"provenance"},{"text":"Does the assessment separately address skin contact and the airborne species actually measured?","id":"exposure-benchmark-fit-q02","kind":"measurement"}]}]},{"id":"handling-evidence","name":"Handling evidence","description":"Match controls to the actual material and proposed operation.","findings":[{"id":"substance-versus-mixture-controls","name":"Substance versus mixture controls","description":"Evaluate handling requirements using the MMT concentration, carrier composition and applicable safety documentation.","questions":[{"text":"Which current safety data sheet and verified hazard classification cover this sample?","id":"substance-versus-mixture-controls-q01","kind":"provenance"},{"text":"Which documented controls address contact, release and fire hazards for the proposed operation?","id":"substance-versus-mixture-controls-q02","kind":"action"}]}]}]},{"id":"fuel-use-and-downstream-boundaries","name":"Fuel use and downstream boundaries","description":"Evaluate proposed fuel-additive use and distinguish parent MMT from downstream materials.","layers":[{"id":"jurisdictional-use-eligibility","name":"Jurisdictional use eligibility","description":"Bind use decisions to fuel category, location, date and concentration basis.","findings":[{"id":"applicable-use-constraints","name":"Applicable use constraints","description":"Require direct evidence for restrictions and permissions rather than inferring them from commercial availability.","questions":[{"text":"Which current authority governs MMT use for the proposed fuel category and jurisdiction?","id":"applicable-use-constraints-q01","kind":"provenance"},{"text":"What concentration, labelling or other conditions must be satisfied before that use can proceed?","id":"applicable-use-constraints-q02","kind":"action"}]}]},{"id":"parent-and-transformation-products","name":"Parent and transformation products","description":"Maintain the boundary between MMT and manganese-bearing products of use or release.","findings":[{"id":"species-specific-downstream-evidence","name":"Species-specific downstream evidence","description":"Link transformation evidence to neighbouring substance and process models without assigning their properties to intact MMT.","questions":[{"text":"Does a downstream measurement identify intact MMT, a particular transformation product or only total manganese?","id":"species-specific-downstream-evidence-q01","kind":"measurement"},{"text":"Which identified residues or emissions require links to separate substance or combustion-process models?","id":"species-specific-downstream-evidence-q02","kind":"boundary"}]}]}]},{"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 methylcyclopentadienyl manganese tricarbonyl 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 methylcyclopentadienyl manganese tricarbonyl this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-standards-and-regulation","name":"Standards and regulation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these standards and regulation hold for the sense of methylcyclopentadienyl manganese tricarbonyl this model covers, and on what evidence?","id":"evidence-standards-and-regulation-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 methylcyclopentadienyl manganese tricarbonyl 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 methylcyclopentadienyl manganese tricarbonyl 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 methylcyclopentadienyl manganese tricarbonyl this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of methylcyclopentadienyl manganese tricarbonyl this model covers, and on what evidence?","id":"evidence-regional-variation-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 methylcyclopentadienyl manganese tricarbonyl this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe MMT as a gasoline additive and summarize debate about its health and engine effects with sources.","Report its regulatory status in a jurisdiction from official sources."],"mustNot":["Add MMT to fuel where it is restricted or above permitted limits.","Hide the presence of manganese additives in fuel from buyers.","Handle it without the protection its safety data sheet requires.","Release it into soil, drains or waters."],"requiresHuman":["Approving fuel formulations that contain MMT."]},"ethics":{"considerations":["Airborne manganese from fuel combustion raises public health concerns.","Fuel additive choices affect everyone breathing city air."],"affectedParties":["The public breathing exhaust","Fuel workers","Vehicle owners"]},"owners":{"steward":"The fuel producer or blender; fuel quality and environmental authorities regulate its use.","roles":[],"masterSystems":["National chemical inventories"]},"relations":[{"target":"Q11173","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.methylcyclopentadienyl-manganese-tricarbonyl","Wikidata: Q158568 (https://www.wikidata.org/wiki/Q158568)"]},"properties":{"applicability":"required","items":["Chemical identifier reconciliation: Registry id, CAS number, verified EC number, structure-matched PubChem record and source version","MMT assay and grade: Mass percent MMT; analytical method, uncertainty and grade specification","Manganese content: Mass percent Mn or mg Mn/L, with matrix and temperature where relevant","Impurity and carrier profile: Constituent identity, concentration, detection limit and role","Physical phase: Liquid, solid or mixed phase; temperature in °C and pressure in kPa","Thermophysical properties: Melting/freezing and boiling temperature in °C; density in g/mL; vapour pressure in Pa; conditions and method required","Light exposure and chemical integrity: Exposure history; intact, suspected degradation or analytically confirmed degradation","Exposure benchmark: mg Mn/m³ or mg MMT/m³; averaging period, route notation, authority and effective date","Hazard and use classification: Verified GHS classification and jurisdiction-specific permitted, restricted, prohibited or unresolved use status"]},"recognition":{"applicability":"required","items":["An orange to yellow liquid with a herbal odour.","Containers carry toxic hazard pictograms."]},"capabilities":{"applicability":"required","items":["Reconcile a labelled sample with the registered MMT identity using identifiers and analytical evidence.","Assess whether assay, carrier and impurity data satisfy an intended grade.","Convert MMT and manganese concentration bases when composition, units and matrix are established.","Flag samples for further analysis when storage history or observations suggest degradation.","Compare exposure measurements with applicable benchmarks after aligning units and averaging periods.","Determine which documented constraints apply to a proposed MMT use in a specified jurisdiction."]},"hazards":{"applicability":"required","items":["Toxicity by skin contact, inhalation and ingestion.","Manganese emissions from combustion.","Possible deposits affecting engine and emission controls."]},"interfaces":{"applicability":"required","items":["Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations."]},"context":{"applicability":"required","items":["Methylcyclopentadienyl manganese tricarbonyl is used as an antiknock additive in some gasoline formulations.","It is encountered in fuel production, additive testing and environmental investigations concerning manganese associated with fuel use."]}},"sources":[{"title":"Wikidata item Q158568: methylcyclopentadienyl manganese tricarbonyl","url":"https://www.wikidata.org/wiki/Q158568","note":"identity and sense of the item"},{"title":"Wikipedia: Methylcyclopentadienyl manganese tricarbonyl","url":"https://en.wikipedia.org/wiki/Methylcyclopentadienyl_manganese_tricarbonyl","note":"general description of the item"}],"openQuestions":["Which EC identifier and PubChem structure record should be canonical after resolving differing organometallic representations?","Which measured thermophysical values are reliable for neat MMT, with explicit pressure, temperature, purity and method?","Which analytical methods distinguish intact MMT from other manganese species in concentrates, fuels and exposure samples?","Which degradation products and requalification criteria are supported for realistic light exposure and storage histories?","Which current GHS classifications, exposure requirements and fuel-use restrictions apply in the intended jurisdictions?"],"resources":{"spec":"/models/things/publications/thing-q158568/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q158568/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T11:18:25Z","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 2026-10-07T10:10:26+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}