Terphenyl

Terphenyls are a group of closely related aromatic hydrocarbons. Also known as diphenylbenzenes or triphenyls, they consist of a central benzene ring substituted with two phenyl groups. The three isomers are ortho-terphenyl, meta-terphenyl, and para-terphenyl. Commercial grade terphenyl is generally a mixture of the three isomers. This mixture is used in the production of polychlorinated terphenyls, which were formerly used as heat storage and transfer agents.[2]

para-Terphenyl
Names
Preferred IUPAC name
11,21:24,31-Terphenyl[1]
Other names
1,1':4',1''-Terphenyl[1]
p-Terphenyl
1,4-Diphenylbenzene
para-Diphenylbenzene
p-Diphenylbenzene
para-Triphenyl
p-Triphenyl
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.043.146
UNII
Properties
C18H14
Molar mass 230.310 g·mol−1
Appearance White powder[2]
Density 1.24 g/cm3
Melting point 212 to 214 °C (414 to 417 °F; 485 to 487 K)[2]
212-213 °C[3]
Boiling point 389 °C (732 °F; 662 K)[3]
Insoluble[2]
1.65[4]
Hazards
Main hazards Iritant (Xi)
R-phrases (outdated) R36/37/38 R50/53
S-phrases (outdated) S26 S60 S61
NFPA 704 (fire diamond)
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
2
0
Flash point 207 °C (405 °F; 480 K)[3]
NIOSH (US health exposure limits):
PEL (Permissible)
 C 9 mg/m3 (1 ppm)[5][6][7]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

p-Terphenyl is the most common isomer. It is used as a laser dye and a sunscreen ingredient.[2]

  • ortho-Terphenyl
  • meta-Terphenyl
  • para-Terphenyl

See also

References
  1. Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 345. doi:10.1039/9781849733069-00130. ISBN 978-0-85404-182-4.
  2. p-Terphenyl at chemicalland21.com
  3. p-Terphenyl at Sigma-Aldrich
  4. "Organic molecular single crystals". cryos-beta.kharkov.ua.
  5. NIOSH Pocket Guide to Chemical Hazards. "#0591". National Institute for Occupational Safety and Health (NIOSH).
  6. NIOSH Pocket Guide to Chemical Hazards. "#0592". National Institute for Occupational Safety and Health (NIOSH).
  7. NIOSH Pocket Guide to Chemical Hazards. "#0593". National Institute for Occupational Safety and Health (NIOSH).
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