| Agent Name |
Methylcyclopentadienyl manganese tricarbonyl |
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| Alternative Name |
MMT |
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| CAS Number |
12108-13-3 |
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| Formula |
C9-H7-Mn-O3 |
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| Major Category |
Metals |
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| Synonyms |
CI-2; Combustion Improver-2; Manganese, tricarbonylmethylcyclopentadienyl; 2-Methylcyclopentadienyl manganese tricarbonyl; MMT; [NIOSH] |
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| Category |
Metals, Organic Compounds |
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| Description |
Yellow to dark-orange liquid with a faint, pleasant odor. [Note: A solid below 36 degrees F.] [NIOSH] |
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| 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] |
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| 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] |
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| Reference Link |
Use of MMT in Canadian gasoline: health and environment issues |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
Yes |
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| Bioaccumulates |
Yes |
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| TLV (ACGIH) |
0.2 mg/m3, as Mn |
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| Vapor Pressure |
0.04 mm Hg |
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| Lethal Concentration |
LC50 (rat) = 8.5 ppm/4 hr; |
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| Explanatory Notes |
VP = 7 mmHg at 212 degrees F; Flash point = 230 deg F; [CHEMINFO] |
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| Adverse Effects |
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| Neurotoxin |
Other CNS Neurotoxin |
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| Hepatotoxin |
Hepatotoxin, Secondary |
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| Nephrotoxin |
Yes |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: METHYLCYCLOPENTADIENYL MANGANESE TRICARBONYL
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