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Tetramethyllead

Properties, data and information sources.

 

Contents

Names and Identifiers

Name
Tetramethyllead
Formula
C4H12Pb
Pb(CH3)4
Molar mass
267.34 (g/mol)
CAS registry number
75-74-1
EC number EINECS
200-897-0
InChI Key
XOOGZRUBTYCLHG-UHFFFAOYSA-N

Systematic name
tetramethylplumbane

Other names, synonyms
Tetramethylplumbane; Lead tetramethyl; Methylplumbane

Abbreviation
TML

Trade names; preparations
Octel Fluid; Octel TML

 

Chemical formulas

Molecular formula and structural formula of Tetramethyllead:

 

C4H12Pb or Pb(CH3)4

Mr = 267.34 g/mol

tetramethylplumbane
SMILES: C[Pb](C)(C)C

 

Data and Properties

In its pure form, tetramethyl lead is a volatile, colorless, sweet-smelling, slightly fruity liquid with a strong refractive index. The commercial chemical is often colored with red, orange, or blue dyes.

solubility:
+ Soluble in ether, absolute alcohol, organic solvents.
- Practically insoluble in water (300 mg/L at 20 °C).
  partition coefficient logPOW = 2.97.
melting point
-27.5 °C
boiling point
110 °C
flash point
37.8 °C
ignition temperature
254 °C
density
1.995 g cm-3 at 20 °C
vapor pressure
32 mbar at 20 °C
viscosity
0.571 mm2/s
refractive index
nD = 1.5120 at 20 °C
standard enthalpy of formation
97.9 kJ/mol (25 °C [l])
135.9 kJ/mol [g]
ionization energy
8.50 eV

 

Spectroscopic data:

SpectraBase (NMR, IR, FTIR, Raman, UV-Vis, MS ... spectra)
3U5VJBwSLgM

Calculated NMR spectrum (Predict Spectra via NMRDB)
1H NMR Spektrum, 13C NMR Spektrum.

 

Percentage and isotopic composition:

Mass-related elemental composition and isotope proportions of the compound Tetramethyllead - C4H12Pb - calculated based on molecular mass.

Symbol
Element ENumber x
of atoms ExData of the element
and isotopes *Percentages
of isotopesPercentage of
Ex in formula massC
Carbon4 Ar = 12.011 u
ΣAr = 48.044 u
12C: 12 u [98,94 %]
14C: 14.00324 u [<< 1 %]
13C: 13.00335 u [1,06 %] 
12C: 17.78063 %
14C: trace
13C: 0.19049 %
17.9711 %H
Hydrogen12 Ar = 1.008 u
ΣAr = 12.096 u
3H: 3.01605 u [<< 1 %]
1H: 1.00783 u [99,99 %]
2H: 2.0141 u [0,01 %] 
3H: trace
1H: 4.52412 %
2H: 0.00045 %
4.5246 %Pb
Lead1ΣAr = 207.2 u
206Pb: 205.97447 u [24,1 %]
204Pb: 203.97304 u [1,4 %]
208Pb: 207.97665 u [52,4 %]
207Pb: 206.9759 u [22,1 %] 
206Pb: 18.67854 %
204Pb: 1.08506 %
208Pb: 40.61225 %
207Pb: 17.12845 %
77.5043 %

*) The third column lists the atomic masses or isotope masses of the elements involved and - in square brackets - the natural isotope composition.

 

More calculated data

The molar mass is M = 267.34 grams per mole.

The amount of substance in one kilogram of the substance is n = 3.741 mol.

The amount of substance in one gram of the substance is n = 0.004 mol.

Monoisotopic mass: 268.0705533864 Da - related to 12C41H12208Pb.

 

Hazard warnings according to GHS

(General information without guarantee of accuracy and completeness! The information does not replace the chemical safety data sheet or a risk assessment, but rather provides a general overview of the risk posed by the hazardous substance.

Signal word: Danger

GHS hazard statements (H phrases):


H226
Flammable liquid and vapour

H300
Fatal if swallowed

H302
Harmful if swallowed

H310
Fatal in contact with skin

H330
Fatal if inhaled

H332
Harmful if inhaled

H360
May damage fertility or the unborn child

H373
May cause damage to organs through prolonged or repeated exposure

H400
Very toxic to aquatic life

H410
Very toxic to aquatic life with long lasting effects

Tetramethyl lead can decompose explosively above 90 °C, forming toxic lead vapors.

LD50 (rat, oral): 105 mg/kg.

Labeling in the EU: See ECHA Substance Infocard 100.000.816.

For toxicology and occupational safety when handling Tetramethyllead as well as measures to be taken in case of danger, see: Hazardous Substances Information System GESTIS, ZVG-Nr. 016120.

International Chemical Safety Card ICSC (SDS, MSDS): See ICSC: 0200.

 

External Sources

PubChem:ID 6394ChemSpider:ID 6154UNII of the FDA (USA):Unique Ingredient Identifier C7J62Z32IWEPA CompTox Chemicals Dashboard:DTXSID0026123

 

Manufacturers and Sources of Supply

The table below lists producers and suppliers of Tetramethyllead as a commercial chemical for laboratories, research, industry and production with the corresponding contact details.

 

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Last update: 2025-12-12

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