Tetramethylsuccinonitrile
Chemical compound From Wikipedia, the free encyclopedia
Chemical compound From Wikipedia, the free encyclopedia
Tetramethylsuccinonitrile or TMSN is an organic compound with the formula (C(CH3)2CN)2, classified as a dinitrile. It is a colorless and odorless solid. TMSN is the byproduct from the use of some radical initiators used in polymer manufacture.[6]
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Names | |||
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Preferred IUPAC name
Tetramethylbutanedinitrile | |||
Other names
Butanedinitrile, 2,2,3,3-tetramethyl [2] | |||
Identifiers | |||
3D model (JSmol) |
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Abbreviations | TMSN[3] | ||
ChemSpider | |||
ECHA InfoCard | 100.129.378 | ||
MeSH | tetramethylsuccinonitrile | ||
PubChem CID |
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UNII | |||
CompTox Dashboard (EPA) |
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Properties | |||
C8H12N2 | |||
Molar mass | 136.198 g·mol−1 | ||
Appearance | Colourless crystals | ||
Odor | odorless[4] | ||
Density | 1.07 g mL−1 | ||
Melting point | 169.1 °C; 336.3 °F; 442.2 K | ||
Boiling point | sublimes[4] | ||
Thermochemistry | |||
Std enthalpy of formation (ΔfH⦵298) |
13.6–16.2 kJ mol−1 | ||
Std enthalpy of combustion (ΔcH⦵298) |
−4.8767–−4.8793 MJ mol−1 | ||
Hazards | |||
GHS labelling: | |||
Danger | |||
H300, H310, H315, H319, H330, H370, H372, H412 | |||
P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P302+P352, P304+P340, P305+P351+P338, P307+P311, P310, P314, P320, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P403+P233, P405, P501 | |||
Lethal dose or concentration (LD, LC): | |||
LD50 (median dose) |
38.9 mg/kg (rat, oral)[5] | ||
LCLo (lowest published) |
28 ppm (mouse, 3 hr) 6 ppm (rat, 30 hr)[5] | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible) |
TWA 3 mg/m3 (0.5 ppm) [skin][4] | ||
REL (Recommended) |
TWA 3 mg/m3 (0.5 ppm) [skin][4] | ||
IDLH (Immediate danger) |
5 ppm[4] | ||
Safety data sheet (SDS) | ICSC 1121 | ||
Related compounds | |||
Related alkanenitriles |
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Related compounds |
DBNPA | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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TMSN is derived from 2,2'-azobis-isobutyronitrile:
AIBN is a common radical initiator in the manufacture of polyvinyl chloride polymers.
Because PVC is pervasive and can contain TMSN, the safety aspects of this dinitrile has generated interest.[7]
Symptoms of large or short exposure to this substance include convulsions, dizziness, headache, nausea, vomiting or even unconsciousness, hence affects central nervous system.
In regards to occupational exposures, the U.S. Occupational Safety and Health Administration and the U.S. National Institute for Occupational Safety and Health have set limits for dermal exposure at 3 mg/m3 over an eight-hour time-weighted average.[3]
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