(Z)-Stilbene
(Z)-Stilbene is a diarylethene, that is, a hydrocarbon consisting of a cis ethene double bond substituted with a phenyl group on both carbon atoms of the double bond. The name stilbene was derived from the Greek word stilbos, which means shining.
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IUPAC names
cis-1,2-Diphenylethylene (Z)-1,2-Diphenylethene | |
Other names
cis-Stilbene | |
Identifiers | |
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ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.010.406 |
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CompTox Dashboard (EPA) |
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Properties | |
C14H12 | |
Molar mass | 180.250 g·mol−1 |
Appearance | Liquid |
Melting point | 5 to 6 °C (41 to 43 °F; 278 to 279 K) |
Boiling point | 307 °C (585 °F; 580 K) at 1 atm (82°C to 84°C at 0.4 mmHg) |
Practically insoluble | |
Hazards | |
Safety data sheet | Oxford MSDS |
R-phrases (outdated) | R36 R38 |
S-phrases (outdated) | S26 S36 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Infobox references | |
Isomers
Stilbene exists as two possible isomers known as (E)-stilbene and (Z)-stilbene. (Z)-Stilbene is sterically hindered and less stable because the steric interactions force the aromatic rings 43° out-of-plane and prevent conjugation.[1] (Z)-Stilbene has a melting point of 5–6 °C (41–43 °F), while (E)-stilbene melts around 125 °C (257 °F), illustrating that the two compounds are quite different.
Uses
- Stilbene is used in manufacture of dyes and optical brighteners, and also as a phosphor and a scintillator.
- Stilbene is one of the gain mediums used in dye lasers.
Properties
- Stilbene will typically have the chemistry of a diarylethene, a conjugated alkene.
- Stilbene can undergo photoisomerization under the influence of UV light.
- Stilbene can undergo stilbene photocyclization, an intramolecular reaction.
- (Z)-Stilbene can undergo electrocyclic reactions.
Natural Occurrence
Many stilbene derivatives (stilbenoids) are present naturally in plants. An example is resveratrol and its cousin, pterostilbene.
References
- Eliel, Ernest L.; Wilen, Samuel H. (1994). Stereochemistry of Organic Compounds. John Wiley and Sons. pp. 566–567. ISBN 0-471-01670-5.