Nitroxides neutral radical

Neutral organic grouping Nitroxide radicals Lysozyme inhibitors ... 

Returning to the exchangeable proton, we assume that this is the hydroxyl proton. It is obvious that one can discriminate between the cation or the neutral hydrogen-bonded species by means of the hf parameters of this proton. Comparing the hf parameters of this proton with model systems for cations of the type (CHjOH) and for neutral hydrogen-bonded nitroxide radicals, it is derived in [11] that for the cation one would expect = 2.5-3.0 MHz and for the neutral hydrogen-bonded radicals ai = 3.Q-4.6 MHz and = 8-9 MHz neglecting of the nqi. Our data (ai , = 4 and =... 

For example, in triradical 26, the neutral nitronyl(nitroxide) pendants are connected to the polaronic (radical cation) thianthrene hackhone (59). An alternative design was illustrated hy van Meurs and Janssen eg, in diradical 27, the polaronic (radical cation) pendants are attached to the neutral 1,4-PPV hackhone (62) (Fig. 9). 

New evidence, obtained by e.s.r. spectroscopy, suggests that the dye-sensitized or direct light-induced photoxidation of phenothiazine is initiated by an electrophilic attack of singlet oxygen on the unshared electron pair of nitrogen, to give the hydroperoxide (77). Subsequently, depending upon the reaction conditions, the 0—0 or N—O bonds in (77) are cleaved, to yield phenothiazine nitroxide or a neutral phenothiazinyl radical. 

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