Charge-transfer complexes of bromine atoms with haloalkanes and alkanes
- National Inst. of Standards and Technology, Gaithersburg, MD (United States)
- Bhabha Atomic Research Centre, Bombay (India)
Charge-transfer complexes of bromine atoms with haloalkanes and alkanes were produced by pulse radiolysis and by laser-flash photolysis in various organic solvents. Br atoms were produced by photolysis of Br[sub 2] (at 351 or 248 nm), by photolysis of bromoalkanes (at 248 nm), or by radiolysis of bromoalkanes (either in liquid form or in cyclohexane solutions). The transient spectra, monitored within microseconds after the pulse, had absorption maxima that varied between 300 and 500 nm and are ascribed to complexes of Br atoms with the various solvents or other solutes present. The absorption maxima for Br atom complexes with alkanes and chloroalkanes correlate with the ionization potential of these molecules, suggesting the existence of charge-transfer complexes. The correlation for the bromoalkanes was more complex. CBr[sub 4]Br and CHBr[sub 3][center dot]Br were observed to react rapidly (k = 10[sup 8]-10[sup 9] L mol[sup [minus]1] s[sup [minus]1]) with Br[sub 2] and with HBr to transfer their Br atom to these latter molecules. 16 refs., 5 figs., 2 tabs.
- OSTI ID:
- 5651542
- Journal Information:
- Journal of Physical Chemistry; (United States), Vol. 97:36; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALKANES
PHOTOCHEMICAL REACTIONS
BROMINE
HALOGENATED ALIPHATIC HYDROCARBONS
CHARGE TRANSPORT
COMPLEXES
LASER RADIATION
PHOTOLYSIS
RADIOLYSIS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
HALOGENS
HYDROCARBONS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RADIATION EFFECTS
RADIATIONS
400201* - Chemical & Physicochemical Properties
400500 - Photochemistry