Difference between revisions of "Hypobromous acid"
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==Structure== | ==Structure== | ||
| − | Hypobromous acid has a bent ''C''<sub>2v</sub> structure in the vapour phase, as expected from [[VSEPR theory]], with ''r''(Br–O) = 182.80 pm, ''θ''(H–O–Br) = 102.99°.<ref name="v1"/> | + | Hypobromous acid has a bent ''C''<sub>2v</sub> structure in the vapour phase, as expected from [[VSEPR theory]], with ''r''(Br–O) = 182.80 pm, ''θ''(H–O–Br) = 102.99°.<ref name="v1"/> Its [[Rotational spectroscopy|rotational spectrum]] has been extensively studied.<ref>{{citation | first1 = Yoshinori | last1 = Koga | first2 = Harutoshi | last2 = Takeo | first3 = Shigeo | last3 = Kondo | first4 = Masaaki | last4 = Sugie | first5 = Chi | last5 = Matsumura | first6 = G. A. | last6 = McRae | first7 = E. A. | last7 = Cohen | title = The rotational spectra, molecular structure, dipole moment, and hyperfine constants of HOBr and DOBr | journal = J. Mol. Spectrosc. | volume = 138 | issue = 2 | year = 1989 | pages = 467–81 | doi = 10.1016/0022-2852(89)90013-1}}.</ref><ref>{{citation | first1 = G. A. | last1 = McRae | first2 = E. A. | last2 = Cohen | title = The ν<sub>2</sub> band of HOBr | journal = J. Mol. Spectrosc. | volume = 139 | issue = 2 | year = 1990 | pages = 369–76 | doi = 10.1016/0022-2852(90)90074-Z}}.</ref><ref>{{citation | first1 = J. | last1 = Orphal | first2 = Q. | last2 = Kou | first3 = F. | last3 = Kwabia Tchana | first4 = O. | last4 = Pirali | first5 = J.-M. | last5 = Flaud | title = The ν<sub>3</sub> bands of HOBr around 16 μm measured by high-resolution Fourier-transform spectroscopy | journal = J. Mol. Spectrosc. | volume = 221 | issue = 2 | year = 2003 | pages = 239–43 | doi = 10.1016/S0022-2852(03)00222-4}}.</ref><ref>{{citation | first1 = J. | last1 = Orphal | first2 = J.-M. | last2 = Flaud | first3 = Q. | last3 = Kou | first4 = F. | last4 = Kwabia Tchana | first5 = O. | last5 = Pirali | title = The far infrared rotational spectrum of HOBr: line positions and intensities | journal = J. Mol. Struct. | volume = 742 | issue = 1–3 | year = 2005 | pages = 153–59 | doi = 10.1016/j.molstruc.2005.01.006}}.</ref><ref>{{citation | first1 = E. A. | last1 = Cohen | first2 = H. S. P. | last2 = Müller | first3 = T. L. | last3 = Tan | first4 = G. A. | last4 = McRae | title = High resolution spectroscopy of DOBr and molecular properties of hypobromous acid | journal = J. Mol. Spectrosc. | volume = 262 | issue = 1 | year = 2010 | pages = 30–36 | doi = 10.1016/j.jms.2010.04.009}}.</ref> |
==Reactivity== | ==Reactivity== | ||
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===References=== | ===References=== | ||
| − | {{reflist}} | + | {{reflist|2}} |
==External links== | ==External links== | ||
Revision as of 12:41, 1 January 2011
| Hypobromous acid | |
|---|---|
| IUPAC name | Hypobromous acid[note 1] |
| Other names | Bromic(I) acid Bromanol Hydroxidobromine |
| Identifiers | |
| InChI | InChI=1/BrHO/c1-2/h2H |
| InChIKey | CUILPNURFADTPE-UHFFFAOYAL |
| Standard InChI | InChI=1S/BrHO/c1-2/h2H |
| Standard InChIKey | CUILPNURFADTPE-UHFFFAOYSA-N |
| CAS number | [] |
| ChemSpider | |
| Properties[2] | |
| Chemical formula | HOBr |
| Molar mass | 96.911 g mol−1 |
| Acidity (pKa) | 8.70 |
| Structure[3] | |
| Molecular geometry | bent: r(Br–O) = 182.80 pm, θ(Br–O–H) = 102.99° |
| Related compounds | |
| Other hypohalous acids | Hypofluorous acid Hypochlorous acid Hypoiodous acid |
| Other compounds | Hydrobromic acid Bromic acid |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Hypobromous acid, HOBr, is an oxoacid of bromine. It is often considered to be only stable in aqueous solution,[2][4] but it can be prepared in sufficient quantities in the gas phase for spectroscopic studies.[3]
Contents
Preparation
Hypobromous acid can be prepared in solution by the reaction of bromine with a well-stirred suspension of mercury(II) oxide.[2]
- 2 Br2 + 2 HgO + H2O → 2 HOBr + HgO·HgBr2
It is also formed by the disproportionation of bromine in water, although the equilibrium concentration is only 1.15 × 10−3 mol dm−3 in a saturated bromine solution (0.21 mol dm−3) at 25 °C.[2]
- Br2 + H2O ⇌ HOBr + H+ + Br−
It can also be prepared in the gas phase by the reaction of water with dibromine monoxide, which is the formal anhydride of hypobromous acid.
- Br2O + H2O ⇌ 2 HOBr
Structure
Hypobromous acid has a bent C2v structure in the vapour phase, as expected from VSEPR theory, with r(Br–O) = 182.80 pm, θ(H–O–Br) = 102.99°.[3] Its rotational spectrum has been extensively studied.[5][6][7][8][9]
Reactivity
Notes and references
Notes
- ↑ Hypobromous acid is a retained name in IUPAC nomenclature.[1]
References
- ↑ Nomenclature of Inorganic Chemistry; IUPAC Recommendations 2005; Royal Society of Chemistry: Cambridge, 2005; p 287. ISBN 0-85404-438-8, <http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf>.
- ↑ 2.0 2.1 2.2 2.3 Cotton, F. Albert; Wilkinson, Geoffrey Advanced Inorganic Chemistry, 5th ed.; Wiley-Interscience: New York, 1988; pp 563–67. ISBN 0-471-84997-9.
- ↑ 3.0 3.1 3.2 Cohen, E. A.; Mcrae, G. A.; Tan, T. L.; Friedl, R. R.; Johns, J. W. C.; Noel, M. The ν1 Band of HOBr. J. Mol. Spectrosc. 1995, 173 (1), 55–61. DOI: 10.1006/jmsp.1995.1218.
- ↑ Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 999–1007. ISBN 0-08-022057-6.
- ↑ Koga, Yoshinori; Takeo, Harutoshi; Kondo, Shigeo; Sugie, Masaaki; Matsumura, Chi; McRae, G. A.; Cohen, E. A. The rotational spectra, molecular structure, dipole moment, and hyperfine constants of HOBr and DOBr. J. Mol. Spectrosc. 1989, 138 (2), 467–81. DOI: 10.1016/0022-2852(89)90013-1.
- ↑ McRae, G. A.; Cohen, E. A. The ν2 band of HOBr. J. Mol. Spectrosc. 1990, 139 (2), 369–76. DOI: 10.1016/0022-2852(90)90074-Z.
- ↑ Orphal, J.; Kou, Q.; Kwabia Tchana, F.; Pirali, O.; Flaud, J.-M. The ν3 bands of HOBr around 16 μm measured by high-resolution Fourier-transform spectroscopy. J. Mol. Spectrosc. 2003, 221 (2), 239–43. DOI: 10.1016/S0022-2852(03)00222-4.
- ↑ Orphal, J.; Flaud, J.-M.; Kou, Q.; Kwabia Tchana, F.; Pirali, O. The far infrared rotational spectrum of HOBr: line positions and intensities. J. Mol. Struct. 2005, 742 (1–3), 153–59. DOI: 10.1016/j.molstruc.2005.01.006.
- ↑ Cohen, E. A.; Müller, H. S. P.; Tan, T. L.; McRae, G. A. High resolution spectroscopy of DOBr and molecular properties of hypobromous acid. J. Mol. Spectrosc. 2010, 262 (1), 30–36. DOI: 10.1016/j.jms.2010.04.009.
External links
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See also the corresponding article on Wikipedia. |
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