Manganese cyclopentadienyl tricarbonyl

Synonyms

Cyclopentadienylmanganese tricarbonyl; Cyclopentadienyl tricarbonyl manganese; MCT; [NIOSH]

Category

Metals, Organic Compounds

Description

Yellow, crystalline solid with a characteristic odor. [Note: An antiknock additive for gasoline. May be found in an oil & gaseous solution.] [NIOSH]

Sources/Uses

Used as an anti-knock agent in unleaded gasoline--this use not permitted in the U.S.A. since 1981; [ACGIH]

Comments

Injected doses of 20 mg/kg cause convulsions and pulmonary edema in rats. MCT was estimated to be twice as toxic to the lung as MMT (methylcyclopentadienyl manganese tricarbonyl). In chronic inhalation studies, rats showed no outward signs of disease during the exposure period (averaging 1 mg/m3 for 4 hours/day for 11 months), but increased excitability of the nervous system was detected with electrical studies after 7 months of exposure. [ACGIH] See "Manganese" and linked occupational diseases.

Biomedical References

Yes

Yes

0.1 mg/m3, as Mn

Ceiling(OSHA) = 5 mg/m3, as Mn

0.2 mg/m3, as Mn, (inhalable fraction), 0.02 mg/m3, as Mn (respirable fraction)

Explanatory Notes

Sublimes at 75-77 deg C; [CAMEO]

Parkinsonism

Diseases

Occupational diseases associated with exposure to this agent:

• Encephalopathy, acute toxic
• Manganese, chronic toxic effect