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Magnetic field effects on photoreduction reaction of 2‐methyl‐1,4‐naphthoquinone in brij 35 micellar solution with additional radical
Author(s) -
Chen JiaFu,
Xue Xuan
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040221105
Subject(s) - chemistry , flash photolysis , hydrogen atom abstraction , micelle , photochemistry , relaxation (psychology) , radical , nanosecond , photodissociation , radical ion , magnetic field , yield (engineering) , micellar solutions , hydroxyl radical , naphthoquinone , radiolysis , aqueous solution , organic chemistry , laser , reaction rate constant , ion , kinetics , psychology , social psychology , physics , materials science , quantum mechanics , optics , metallurgy
Abstract A study was made of magnetic field effects (MFEs) on the photoreduction reaction of 2‐methyl‐1, 4‐naphthoquinone (MNQ) in Brij 35 micellar solution containing 4‐lauroylamino‐TEMPO (2,2,6,6‐tetramethylpiperidine‐l‐oxyl) radical (L‐R) under magnetic fields below 1.75 T by a nanosecond laser flash photolysis technique. The triplet MNQ mainly underwent the hydrogen abstraction from Brij 35 molecule to give a radical pair. The escaped radical yield increased with magnetic fields from 0 to 0.62 T and then saturated from 0.62 to 1.75 T. MFEs for both system can be explained by the relaxation mechanism. However, it was supposed that additional radical, L‐R affected the MFEs mainly through enhancing the spin‐spin interactions of radical pairs. The effect of the micelle size on MFEs of the studying system was also discussed.