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Volumn 22, Issue 9, 2009, Pages 872-882

Hidden chemistry in phenoxyl radical (C6H5O .) coupling reaction mechanism revealed

Author keywords

Aqueous medium kinetics; Coupling reactions; Phenol oxidation mechanism; Phenoxyl radical; Pulse radiolysis

Indexed keywords

AQUEOUS MEDIUM KINETICS; COUPLING REACTIONS; PHENOL OXIDATION MECHANISM; PHENOXYL RADICAL; PULSE RADIOLYSIS;

EID: 68949202209     PISSN: 08943230     EISSN: 10991395     Source Type: Journal    
DOI: 10.1002/poc.1534     Document Type: Article
Times cited : (11)

References (57)
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    • Radiation chemistry of phenols
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    • P. Neta, S. Steenken, Radiation chemistry of phenols. In The Chemistry of Phenols (Ed. Z. Rappoport), John Wiley & Sons, Ltd., New York, 2003. Chapter 15.
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    • For pulse radiolytic study of radical-radical reactions, an electron accelerator, e.g. a Febetron providing a narrow width electron pulse (5-15 ns), and high dose per pulse (few 100 Gy) is an ideal machine. However, Forward Industries Ltd. (formerly Radiation Dynamics), UK supplied linear accelerator employed in the present study provides 15-45 Gy dose with 530 ns wide pulses, and 45-135 Gy dose with 2200 ns wide pulses. For the duration of such pulses, a significant amount of radical-radical reactions, and the consequential chemistry, occur. Such effects are satisfactorily quantified and included in the overall data analysis protocol as described herein, for dosimetry as well as other measurements
    • T. N. Das, Indian J. Rad. Res. 2005, 2, 1-8. For pulse radiolytic study of radical-radical reactions, an electron accelerator, e.g. a Febetron providing a narrow width electron pulse (5-15 ns), and high dose per pulse (few 100 Gy) is an ideal machine. However, Forward Industries Ltd. (formerly Radiation Dynamics), UK supplied linear accelerator employed in the present study provides 15-45 Gy dose with 530 ns wide pulses, and 45-135 Gy dose with 2200 ns wide pulses. For the duration of such pulses, a significant amount of radical-radical reactions, and the consequential chemistry, occur. Such effects are satisfactorily quantified and included in the overall data analysis protocol as described herein, for dosimetry as well as other measurements.
    • (2005) , vol.2 , pp. 1-8
    • Das, T.N.1    Indian, J.2
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    • Note
    • A note of caution: In general, during pulse radiolysis measurements, sample solution replenishment is routinely achieved with a flow arrangement. Either a continuous solution flow through the cell is maintained, or to minimize any error due to the physical movement of the sample for slower time-scale studies, the flow is momentarily stopped during the measurement duration, and continued till the next pulsing. In our study we observed that while employing alkaline solutions, flow arrangements in either mode produced significantly erroneous results due to accumulation or retention of a small fraction of the product 4, 4'-biphenol in the reaction cell. Therefore, all alkaline medium data were obtained in single-shot mode, i.e.fresh solution was used for each electron pulse as discussed in the experimental section, and the sample cells were cleaned thoroughly and dried before reuse.


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