Maity, D. K. ; Mohan, Hari ; Chattopadhyay, S. ; Mittal, J. P. (1997) Reaction of hydroxyl radicals with 1-bromo-N-iodoalkanes in aqueous solution: 2C-3E bonded radical cations Radiation Physics and Chemistry, 49 (1). pp. 21-24. ISSN 0969-806X
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09698...
Related URL: http://dx.doi.org/10.1016/S0969-806X(96)00099-0
Abstract
The transient optical absorption bands (λ max = 310, 350 nm) formed on reaction of OH radicals with 1-bromo-4-iodobutane (pH = 6) are assigned to OH-adduct. In acidic solutions (pH = 3.0), the OH adduct is converted to a transient band with λ max = 440 nm. This band is assigned to intramolecular radical cation formed on p-orbital overlap of oxidized iodine with bromine. In case of 1-bromo-5-iodopentane, the transient optical absorption bands formed on the reaction of OH radicals at pH = 6.0 are at λ max = 310 and 350 nm. In acidic aqueous solution (pH = 3.0), the OH adducts are converted to intramolecularly coordinated solute radical cation (λ max = 410 nm) through acid catalysed dehydration reaction. In case of 1-bromo-3-iodopropane, the hydroxyl radicals react to form absorption band with λ max = 400 nm and a small shoulder in 310-330 nm region at neutral pH. In acidic solutions (pH = 3.0), the absorption of 310-330 nm band decreases and that of 400 nm band increases. The transient band at 400 nm is assigned to intramolecular radical cation. A fraction of OH radical is able to react by electron transfer mechanism at neutral pH. The fraction of OH radical forming OH-adduct at neutral pH decreases and is converted to radical cation in acidic pH.
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ID Code: | 25724 |
Deposited On: | 04 Dec 2010 11:49 |
Last Modified: | 07 Jun 2011 07:08 |
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