“…The same technique was applied to isomeric dichlorobenzyl radicals [8,9] that emit much weaker visible fluorescence, and in these studies the red-shifts of their electronic transition energies were discussed in terms of substitution positions on the benzene ring [10,11]. Recently, several hetero dihalobenzyl radicals [12][13][14] were examined to probe the synergic effects of hetero halo substituents on red-shifts of electronic transition energy and shifts of vibrational mode frequency. Some spectroscopic attempts have been made to characterize substituted ␣-methylbenzyl radicals.…”