What is the melting point of stilbene dibromide?
241 °C
meso-Stilbene dibromide
| Names | |
|---|---|
| Chemical formula | C14H12Br2 |
| Molar mass | 340.058 g·mol−1 |
| Appearance | White solid |
| Melting point | 241 °C (466 °F; 514 K) |
What is the melting point of 1/2 dibromo 1 2 Diphenylethane?
235°C to 241°C
Specifications
| CAS Min % | 95.0 |
|---|---|
| CAS Max % | 100.0 |
| Color | Undesignated |
| Melting Point | 235°C to 241°C |
| Assay Percent Range | 95% min. (HPLC) |
Is meso stilbene dibromide soluble in water?
Chemical Properties ca 241° dec. Insoluble in water.
Is stilbene a Lachrymator?
Stilbene dibromide is corrosive and a lachrymator. It may cause irritation to skin, the digestive tract (if swallowed), and respiratory tract (if inhaled).
Why is the melting point of Z stilbene so much lower than e stilbene?
(Z)-Stilbene is sterically hindered and less stable because the steric interactions force the aromatic rings 43° out-of-plane and prevent conjugation. (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.
What is meso stilbene dibromide used for?
Uses of Stilbene 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.
What is the molar mass of stilbene dibromide?
340.05
Stilbene;dibromide
| PubChem CID | 53432511 |
|---|---|
| Molecular Formula | C14H12Br2-2 |
| Molecular Weight | 340.05 |
| Parent Compound | CID 11502 (Stilbene) |
| Component Compounds | CID 11502 (Stilbene) CID 260 (Hydrogen bromide) |
How do you purify Diphenylacetylene?
Purify your impure diphenylacetylene by recrystallization from a mixture of ethanol and water. Dissolve the solid in 10-15 mL of warm ethanol by heating the solution on a hot plate. Do not overheat the solution. You should keep the temperature of the flask no hotter than your hand can stand.
Why one isomer has a lower melting point but higher boiling point?
The less symmetrical cis isomer is less efficiently packed in the solid state. Thus the cis isomers are farther apart in the solid state, attraction between molecules are weaker, hence melting point is lower.
What is the product of bromination of cis stilbene?
Bromination of trans-stilbene produces predominantly meso-1,2-dibromo-1,2-diphenylethane (sometimes called meso-stilbene dibromide), in line with a mechanism involving a cyclic bromonium ion intermediate of a typical electrophilic bromine addition reaction; cis-stilbene yields a racemic mixture of the two enantiomers …
What is the use of stilbene?
Stilbene is used in manufacture of dyes and optical brighteners, and also as a phosphor (luminescence) and a scintillator [276]. Many stilbene derivatives (stilbenoids) are present naturally in plants. An example is resveratrol and its cousin, pterostilbene.
Which isomer has highest boiling point?
cis isomers
Boiling point of cis isomers are higher than trans isomers because cis isomers are polar and hence they have strong intermolecular forces between the molecules. Because of this high polarity and high intermolecular force, a lot of energy will be required to break the bonds. Hence, cis isomers have higher boiling point.