(Methylcyclopentadienyl)manganese(I) tricarbonyl

Ethyl MMT, MCMT, MMT, NSC 22316, (Methylcyclopentadienyl)tricarbonylmanganese, Tricarbonyl(2-methylcyclopentadienyl)manganese
Linear Formula:
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

vapor density

>1 (vs air)

Quality Level

vapor pressure

0.05 mmHg ( 20 °C)

reaction suitability

core: manganese
reagent type: catalyst

refractive index

n20/D 1.584 (lit.)


232-233 °C (lit.)


−1 °C (lit.)


1.38 g/mL at 25 °C (lit.)

SMILES string




InChI key


General description

Methylcyclopentadienyl manganese tricarbonyl (MMT) is commonly used as an antiknock agent in gasoline. It is also used as an additive in unleaded gasoline.


Methylcyclopentadienyl manganese tricarbonyl can be used for doping of ZnSe nanocrystals.
It can also be used as a reactant for:
  • Aldol addition reactions.
  • Preparation of homo- and heteronuclear mixed biscarbene complexes with conjugated bithiophene units.
  • Molecular fragmentation using shaped femtosecond laser pulses.
  • Preparation of MnAs thin films grown on GaAs(001) by metalorganic vapour phase epitaxy (MOVPE).


1, 50 g in glass bottle

Signal Word


Target Organs


Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


UN 3281 6.1 / PGII

WGK Germany


Flash Point(F)

204.8 °F - closed cup

Flash Point(C)

96 °C - closed cup

Kinjal J Shah et al.
Journal of colloid and interface science, 529, 90-99 (2018-06-11)
A variety of quaternary ammonium salts with different carbon chain lengths were used to modify and convert montmorillonite clay to organoclays. The surface modification attributing to the wettability was investigated using various techniques. The zeta-potential values of all clays showed...
Vadim V Lozovoy et al.
The journal of physical chemistry. A, 112(17), 3789-3812 (2008-04-25)
The possibility that chemical reactions may be controlled by tailored femtosecond laser pulses has inspired recent studies that take advantage of their short pulse duration, comparable to intramolecular dynamics, and high peak intensity to fragment and ionize molecules. In this...
Sébastien Bolté et al.
Journal of toxicology and environmental health. Part A, 67(6), 459-467 (2004-03-06)
Methylcyclopentadienyl manganese tricarbonyl (MMT), is an additive in gasoline, and its combustion leads to the emission of Mn particles, which increase atmospheric metal concentrations. The objective of this study was to determine the level of outdoor and indoor respirable Mn...
A K Bhuie et al.
The Science of the total environment, 339(1-3), 167-178 (2005-03-03)
The environmental impacts of gasoline additives such as lead (Pb) and Methyl Tertiary Butyl Ether (MTBE) are well documented, leading to the phasing out of these additives. In contrast, little is known about the health and environmental impacts of potential...
D R Lynam et al.
Neurotoxicology, 20(2-3), 145-150 (1999-07-01)
Methylcyclopentadienyl Manganese Tricarbonyl (MMT) has been used since the 1970s in the U.S. as a gasoline octane enhancer Extensive testing of the effects of MMT on regulated gaseous emissions carried out on a wide variety of automobiles showed that use...

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