Electronic spectra hydrogen peroxide

Secondary radicals may be formed by reaction between primary radicals and solvent. Thus hydroxyl radicals are produced by the photolysis of hydrogen peroxide in an isopropanol glass . At 110° K a seven-line spectrum, with intensities of 1 6 15 20 15 6 1, was observed. Such a structure is to be expected from an unpaired electron which interacts equally with six protons, and since it is known that there is no interaction with the proton of the -OH group in alcohol radicals, the spectrum suggests that the radical is (CH3)2COH. 

In neutral or acid solutions the hydrogen peroxide is present in solution almost entirely as H2O2, while in alkaline solutions (pH > 12) appreciable amounts of the anion H02 must be present. This is also shown clearly by the change in the absorption spectrum (33). In the latter case the photochemical primary process is presumably represented by the electron transfer process ... 

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