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Product Name: Molybdenum Pentachloride
Synonyms: Molybdenum(V) chloride, Molybdenum chloride (MoCl5)
Chemical Formula: MoCl5
CAS Number: 10241-05-1
Recommended Use: Laboratory chemical, synthesis of inorganic compounds, catalyst applications
Manufacturer: Common chemical producers and lab suppliers
Contact Information: Emergency telephone numbers and corporate contact details from manufacturer or supplier
Classification (GHS): Acute Toxicity (Oral, Inhalation, Dermal) Category 3, Skin Corrosion/Irritation Category 1B, Serious Eye Damage Category 1, Specific Target Organ Toxicity (Single Exposure) Category 3
Signal Word: Danger
Hazard Statements: Toxic if swallowed, inhaled, or in contact with skin; causes severe skin burns and eye damage; may cause respiratory irritation
Pictograms: Skull and crossbones, corrosive, exclamation mark
Precautionary Statements: Avoid breathing dust or fumes; wear protective gloves/clothing/eye protection; wash any exposed skin thoroughly after handling; keep away from food and drink
Symptoms: Burns, irritation to mucous membranes, shortness of breath, coughing, abdominal pain, eye damage
Chemical Name: Molybdenum Pentachloride
Concentration: 98–100% by weight
CAS Registry Number: 10241-05-1
Other Names: MoCl5
Impurities: Small percentages of Molybdenum trichloride (MoCl3) and other molybdenum chlorides possible as trace impurities
Eye Contact: Rinse immediately with plenty of water for at least 15 minutes, lifting upper and lower eyelids; seek urgent medical attention
Skin Contact: Remove contaminated clothing and shoes quickly, rinse skin under running water for minimum 15 minutes; consult a physician
Inhalation: Move to fresh air at once, keep warm and at rest, seek immediate medical advice; provide oxygen if breathing is difficult
Ingestion: Rinse mouth; do not induce vomiting, give water only if conscious, transport to a physician or emergency room at once
Most Important Symptoms: Immediate pain, severe burns to mucous tissue, difficulty breathing, respiratory tract irritation, potential for pulmonary edema, visual damage
Medical Attention: Professional assistance required due to risk of tissue destruction and systemic toxicity; treat symptomatically
Suitable Extinguishing Media: Dry sand, powdered graphite, dry chemical extinguishers; never use water or foam
Hazards from Combustion: Releases corrosive and toxic gases, including hydrogen chloride, molybdenum oxides; strong exothermic reaction with water
Protective Equipment: Full-face self-contained breathing apparatus (SCBA) and chemical protective suit
Firefighting Instructions: Evacuate area, cool containers with non-water means from distance, contain runoff to prevent environmental damage
Special Hazards: Rapid hydrolysis releasing HCl fumes, potential violent reaction with water or moist air
Personal Precautions: Evacuate unnecessary personnel, restrict access, ventilate area, keep away ignition sources
Protective Equipment: Wear chemical-resistant gloves, goggles, full protective suit and suitable respirator
Environmental Precautions: Prevent from entering drains, surface water, or soil; contain spillage with inert dry material
Cleanup Methods: Sweep up and place in appropriate chemical waste container; do not flush with water; absorb residues with inert absorbent and seal containers for disposal
Decontamination: Ventilate area thoroughly after cleanup, monitor for hydrogen chloride gas and other vapors until levels fall within safe range
Handling: Use only in fume hood or well-ventilated area with local exhaust, avoid formation of airborne dust, prevent contact with skin, eyes, or clothes; keep away from moisture, acids, and bases
Storage: Store tightly sealed in moisture-proof container, cool, dry, well-ventilated locked chemical storage room; keep away from combustibles, oxidizers, reducing agents; label clearly and segregate from incompatible materials
Special Requirements: Secondary containment, spill tray recommended; ensure emergency showers and eyewash stations are nearby
Technical Measures: Use only non-sparking tools, ground/bond containers, regular checks for container integrity, log inventory and usage
Exposure Limits: No established OSHA, ACGIH, or NIOSH limits for molybdenum pentachloride; general dust ventilation limits for nuisance particulates may apply
Engineering Controls: Laboratory fume hoods, process enclosures, HEPA filters for exhaust, negative air pressure in storage rooms
Personal Protective Equipment: Chemical splash goggles, face shield, heavy-duty rubber gloves, full-length lab coat, disposable coveralls, closed shoes, respiratory protection (NIOSH-approved for vapors/dust), emergency breathing apparatus
Hygiene Measures: Do not eat, drink, or smoke while working; wash hands and face before breaks and after use
Monitoring: Periodic air sampling, personal badge monitors for exposure to acidic gases or particulates suggested for high-volume users
Appearance: Dark reddish-brown to black crystalline solid, sometimes forms as soft purplish flakes
Odor: Sharp, pungent, chlorine-like
Melting Point: 190°C–195°C
Boiling Point: 268°C (sublimes)
Density: 3.1 g/cm³ at 25°C
Solubility: Decomposes in water, soluble in benzene, carbon disulfide, and other organic solvents
Vapor Pressure: Negligible at room temperature; increases rapidly with heat
pH (aqueous suspension): Releases hydrochloric acid leading to acidic pH on contact with moisture
Partition Coefficient (log Kow): Not established
Decomposition Temperature: Rapidly decomposes on contact with water or humid air
Other Properties: Fumes in air, strong oxidizer, reacts vigorously with reducing agents, emits hydrochloric acid upon hydrolysis
Chemical Stability: Stable under recommended storage conditions, decomposes rapidly on exposure to moisture, light, or heat
Reactivity: Violent reaction with water, strong exothermic response, releases hydrogen chloride gas and molybdenum oxides
Incompatible Materials: Water, organic substances, amines, alcohols, alkalis, oxidizing and reducing agents
Hazardous Decomposition Products: Hydrogen chloride, molybdenum oxide fumes, phosgene (possible in mix with organic residue)
Conditions to Avoid: Humidity, open air, high temperatures, contact with common laboratory acids or bases
Acute Toxicity: Harmful by all routes – ingestion, inhalation, dermal; reported oral LD50 (rat): 680 mg/kg; inhalation LC50 (rat): low mg/m³ range
Skin Corrosion/Irritation: Severe corrosive burns, tissue necrosis on contact
Eye Damage/Irritation: Causes permanent damage, blindness likely
Respiratory Sensitization: Severe respiratory tract irritation, possible lung damage, pulmonary edema
Systemic Effects: Potential liver and kidney damage, gastrointestinal corrosion, delayed lung injury
Chronic Effects: Not fully characterized; risk of respiratory issues and cumulative metal buildup when airborne particles are inhaled repeatedly
Carcinogenicity/Mutagenicity: Not classified as carcinogen or mutagen by IARC, OSHA, or NTP
Other Data: Limited human toxicity data; related compounds show mucous membrane irritation and tissue damage
Ecotoxicity: Toxic to aquatic organisms and may cause long-lasting harmful effects in the aquatic environment; high concentrations disrupt plant growth and aquatic life metabolism
Persistence and Degradability: Hydrolyzes rapidly in water releasing molybdenum and chloride ions; environmental persistence in soils and sediments possible under dry conditions
Bioaccumulative Potential: Likely to bioaccumulate in aquatic organisms exposed to molybdenum ions
Mobility in Soil: In wet environments, mobile as soluble molybdenum and chloride; tends to bind clay and organic matter in dry soils
Other Adverse Effects: Contributes to acidification of surface water; forms corrosive runoff damaging infrastructure and aquatic habitats
Waste Treatment Methods: Dispose as hazardous waste at licensed facility; dissolve only under strictly controlled waste treatment protocols, neutralize acids generated
Reuse/Recycling: Unused product not suitable for recycling due to contamination risk
Container Disposal: Decontaminate packaging by rinsing with inert solvent before discarding; dispose of as hazardous chemical packaging
Regulatory Considerations: Comply with national, regional, and local hazardous waste regulations; manifest all disposals and report incidents
Environmental Precautions: Prevent leaks, segregate from non-hazardous waste streams, do not allow entry into sewers or waterways
UN Number: 3260
Proper Shipping Name: Corrosive solid, acidic, inorganic, n.o.s. (contains molybdenum pentachloride)
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: II (medium danger)
Labels Required: Corrosive, Toxic
Special Precautions: Prohibit shipment with foodstuffs, separate from alkalis and combustibles, shipping containers must be tightly sealed and moisture-proof
Emergency Response Guide Number: 154
Regulatory Compliance: Follow all hazardous material regulations for national/international carriage (IMDG, IATA, ADR/RID)
OSHA: Classified as hazardous under OSHA Hazard Communication Standard
TSCA: Listed on Toxic Substances Control Act Inventory
SARA Title III – Section 302/304: Not listed as an extremely hazardous substance
SARA Title III – Section 313: Molybdenum compounds are subject to reporting requirements
EPA: Regulated under CERCLA as a hazardous substance for spills
EU Classification: C (Corrosive), T (Toxic)
WHMIS (Canada): D1B (Toxic), E (Corrosive), requiring controlled product labeling and documentation
Other Specific Provisions: Local workplace chemical safety rules apply; consult regional authorities for additional labeling, storage, and workplace safety requirements
