Products Description of Methylcyclopentadienyl Manganese Tricarbonyl CAS#12108-13-3
Methylcyclopentadienyl manganese tricarbonyl, abbreviated as MMT, is an organomanganese metal complex with molecular formula C₉H₇MnO₃ and molecular weight 218.09. It appears as yellow to orange liquid with a characteristic odor. Its density is 1.38 g/mL at 25°C, melting point −1°C. It is freely soluble in gasoline and most organic solvents, and nearly insoluble in water.
This organometallic compound has moderate volatility and is sensitive to strong light, high temperature and strong oxidants. It serves as an efficient octane booster and antiknock additive for unleaded gasoline.
Methylcyclopentadienyl Manganese Tricarbonyl Chemical Properties
| Melting point | -1 °C (lit.) |
| Boiling point | 232-233 °C (lit.) |
| density | 1.38 g/mL at 25 °C (lit.) |
| vapor density | >1 (vs air) |
| vapor pressure | 0.05 mm Hg ( 20 °C) |
| refractive index | n20/D 1.584(lit.) |
| Fp | 205 °F |
| storage temp. | Poison room |
| form | liquid |
| Specific Gravity | 1.388 |
| color | yellow |
| Water Solubility | Insoluble in water. Soluble in hydrocarbon solvents, alcohols, ether, acetone |
| Sensitive | Air Sensitive |
| Merck | 146223 |
| Exposure limits | ACGIH: TWA 0.2 mg/m3 (Skin) |
| OSHA: Ceiling 5 mg/m3 | |
| NIOSH: IDLH 500 mg/m3; TWA 0.2 mg/m3; TWA 1 mg/m3; STEL 3 mg/m3 | |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| InChIKey | LYHJNAIHGFWRKM-UHFFFAOYSA-N |
| LogP | 3.4 at 26℃ |
| CAS DataBase Reference | 12108-13-3(CAS DataBase Reference) |
| EPA Substance Registry System | Methylcyclopentadienyl manganese tricarbonyl (12108-13-3) |
Safety Information
| Hazard Codes | T,N,T+ |
| Risk Statements | 23/24/25-40-50/53-48/23-38-26-24/25 |
| Safety Statements | 23-26-36/37/39-45-61-60-36/37-28 |
| RIDADR | UN 3281 6.1/PG 2 |
| WGK Germany | 3 |
| RTECS | OP1450000 |
| TSCA | Yes |
| HazardClass | 6.1 |
| PackingGroup | II |
| Hazardous Substances Data | 12108-13-3(Hazardous Substances Data) |
| Toxicity | LD50 orally in mice, guinea pig, rabbit: 352; 905; 95 mg/kg; orally in male, female rats: 175 ±33; 89 ±14; LC50 inhalation in rat: 0.22 mg/l (Stara) |
Product Application of Methylcyclopentadienyl Manganese Tricarbonyl CAS#12108-13-3
MMT is primarily used as antiknock and octane-enhancing additive for unleaded gasoline in refinery fuel blending. It can raise gasoline octane rating by 2–3 units at recommended dosage, suppress engine knocking and improve fuel combustion efficiency. It shows good compatibility with oxygen-containing fuel components such as MTBE and ethanol, helping reduce exhaust pollutant emissions.
Besides fuel industry, it acts as organometallic precursor for MOVPE semiconductor thin film preparation, and dopant for ZnSe nanocrystal material research. It can also be applied as catalyst and reaction raw material in fine organic synthesis, suitable for refinery formulation, fuel additive production and advanced material laboratory research.
