Bromocyclohexane
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| Names | |
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| Preferred IUPAC name
Bromocyclohexane | |
| Other names
Cyclohexyl bromide
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
PubChem CID
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| UNII | |
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| Properties | |
| C6H11Br | |
| Molar mass | 163.06 g/mol |
| Appearance | colorless liquid |
| Density | 1.324 g/cm3 |
| Melting point | −57 °C (−71 °F; 216 K) |
| Boiling point | 166 to 167 °C (331 to 333 °F; 439 to 440 K) |
| Hazards | |
| Flash point | 62.8 °C (145.0 °F; 335.9 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Bromocyclohexane (also called Cyclohexyl bromide, abbreviated CXB) is an organic compound with the chemical formula C6H11Br.
It is used to match the refractive index of PMMA for example in confocal microscopy of colloids. A mixture of cis-decalin and CXB can simultaneously match optical index and density of PMMA.[1] Due to the moderate dielectric constant of CXB (ε = 7.9 [2]), PMMA acquires charges that can be screened by the addition of salt (e.g. tetrabutyl ammonium bromide), leading to a very good approximation of colloidal hard sphere.[3] A drawback is that CXB is a good solvent for PMMA, causing it to swell over time, which may lead to a poor determination of particle radii and determination of solid volume fraction.[4]
Synthesis
Bromocyclohexane can be prepared by the free radical substitution of bromine to the cyclohexane ring at high temperatures or in presence of UV radiation. The reaction is unselective, giving a mixture of polybrominated products. In principle, another synthesis involves addition of HBr to cyclohexene.
References
http://web.pdx.edu/~wamserc/C334F99/Fans.htm
- ^ Wiederseiner, S., Andreini, N., Epely-Chauvin, G. & Ancey, C. Refractive-index and density matching in concentrated particle suspensions: a review. Experiments in Fluids 50, 1183–1206 (2010).doi:10.1007/s00348-010-0996-8
- ^ "Dielectric Constants of Various Materials". Archived from the original on 2013-11-01. Retrieved 2013-10-30.
- ^ Royall, C. P., Poon, W. C. K. & Weeks, E. R. In search of colloidal hard spheres. Soft Matter (2012). doi:10.1039/c2sm26245b
- ^ Poon, W. C. K., Weeks, E. R. & Royall, C. P. On measuring colloidal volume fractions. Soft Matter 8, 21 (2012). doi:10.1039/c1sm06083j
External links
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