The EPRD parameter as a measure of spin delocalization in cyclopentane-1,3-diyl triplet diradicals with extended conjugation π-type substituents
Abstract
π-Substituted cyclopentane-1,3-diyl triplet diradicals 2 were readily prepared from the corresponding azoalkanes 1 by photodenitrogenation in a 2-methyltetrahydrofuran matrix at 77 K. The D values of these triplet diradicals, obtained from the EPR spectra under matrix isolation, depend on the π substituent in the order butadienyl > 2-anthryl >