The radicals 3,5hyphen;dimethylhyphen;4hyphen;azabenzyl and 3hyphen;methylhyphen;2hyphen;azabenzyl have been prepared fromshyphen;collidine (2,4,6hyphen;trimethylpyridine) and 2,6hyphen;lutidine (2,6hyphen;dimethylpyridine) by photolysis in a rigid organic solution and studied by means of threehyphen;step photoselection. Two excited states of the radicals are found, one at about 2.6 eV and the other at about 4.1 eV. These are assigned the symmetries2A2and2B2(inC2ugr;), respectively. The phosphorescence ofshyphen;collidine in an organic matrix is described. The novel technique of ldquo;changinghyphen;axisrdquo; photoselection is described and is used in the assignment of the 3hyphen;methylhyphen;2hyphen;azabenzyl radical. This technique also substantiates the inhyphen;plane character of the transition moment of 2,6hyphen;lutidine in its 270hyphen;nm absorption band.
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