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. There are three substitution patterns: 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.
Names | |
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Preferred IUPAC name 11,21:24,31-Terphenyl | |
Other names 1,1':4',1''-Terphenyl p-Terphenyl 1,4-Diphenylbenzene para-Diphenylbenzene p-Diphenylbenzene para-Triphenyl p-Triphenyl | |
Identifiers | |
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3D model (JSmol) | |
1908447 | |
ChEBI | |
ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.043.146 |
EC Number |
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PubChem CID | |
RTECS number |
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UNII |
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CompTox Dashboard (EPA) | |
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Properties | |
C18H14 | |
Molar mass | 230.310 g·mol−1 |
Appearance | White powder |
Density | 1.24 g/cm3 |
Melting point | 212 to 214 °C (414 to 417 °F; 485 to 487 K) 212-213 °C |
Boiling point | 389 °C (732 °F; 662 K) |
Insoluble | |
Refractive index (nD) | 1.65 |
Hazards | |
GHS labelling: | |
Warning | |
H315, H319, H335, H400 | |
P261, P264, P271, P273, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P391, P403+P233, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | 207 °C (405 °F; 480 K) |
NIOSH (US health exposure limits): | |
PEL (Permissible) | C 9 mg/m3 (1 ppm) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
p-Terphenyl derivatives are found in various fungi and bacteria. One example is atromentin, a pigment found in some mushrooms. These natural p-terphenyls are better described as diphenylquinones or diphenylhydroquinones. Some m-terphenyl compounds occur in plants.
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