Methylcyclopentadienyl manganese tricarbonyl

Agent Name
Methylcyclopentadienyl manganese tricarbonyl
Alternative Name
MMT
CAS Number
12108-13-3
Formula
C9-H7-Mn-O3
Major Category
Metals
Synonyms
CI-2; Combustion Improver-2; Manganese, tricarbonylmethylcyclopentadienyl; 2-Methylcyclopentadienyl manganese tricarbonyl; MMT; [NIOSH]
Category
Metals, Organic Compounds
Description
Yellow to dark-orange liquid with a faint, pleasant odor. [Note: A solid below 36 degrees F.] [NIOSH]
Sources/Uses
Used as a "combustion improver"; [ACGIH] Its use as a gasoline additive was banned by the EPA because it interfered with catalytic converters. [Hawley]
Comments
MMT is toxic to the central nervous system by inhalation and skin absorption. The acute adverse effects in laboratory animals are similar to those of tetraethyl lead with hyperactivity and seizures. Also seen are injuries to the liver, kidneys, and lungs. MMT has a "low order of toxicity" when used as a fuel additive. [ACGIH] When MMT is used as a fuel additive, the magnitude of the risk from chronic environmental exposure is uncertain. [AJIM 2001;39:426-33] See "Manganese" and linked occupational diseases.
Biomedical References

Exposure Assessment

Skin Designation (ACGIH)
Yes
Bioaccumulates
Yes
TLV (ACGIH)
0.2 mg/m3, as Mn
Vapor Pressure
0.047 mm Hg
Lethal Concentration
LC50 (rat) = 8.5 ppm/4 hr;
Explanatory Notes
VP from HSDB (at 20 deg C); VP = 7 mmHg at 212 degrees F; Flash point = 230 deg F; [CHEMINFO]

Adverse Effects

Neurotoxin
Other CNS neurotoxin
Hepatotoxin
Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion
Nephrotoxin
Yes

Diseases, Processes, and Activities Linked to This Agent

Diseases

Occupational diseases associated with exposure to this agent: