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]
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| Names | |
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| 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 | |
CAS Number |
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3D model (JSmol) |
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| ChemSpider |
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| ECHA InfoCard | 100.043.146 |
PubChem CID |
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| UNII |
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CompTox Dashboard (EPA) |
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InChI
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SMILES
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| Properties | |
Chemical formula |
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] |
Solubility in water |
Insoluble[2] |
Refractive index (nD) |
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| R-phrases (outdated) | R36/37/38 R50/53 |
| S-phrases (outdated) | S26 S60 S61 |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) | 
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). | |
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| 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
- 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.
- p-Terphenyl at chemicalland21.com
- p-Terphenyl at Sigma-Aldrich
- "Organic molecular single crystals". cryos-beta.kharkov.ua.
- NIOSH Pocket Guide to Chemical Hazards. "#0591". National Institute for Occupational Safety and Health (NIOSH).
- NIOSH Pocket Guide to Chemical Hazards. "#0592". National Institute for Occupational Safety and Health (NIOSH).
- NIOSH Pocket Guide to Chemical Hazards. "#0593". National Institute for Occupational Safety and Health (NIOSH).
External links
- p-Terphenyl at the Oregon Laser Medical Center
- o-Terphenyl, m-Terphenyl, p-Terphenyl at Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health
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