The EPR D-parameter of 1,3-diarylcyclopentane-1,3-diyl triplet diradicals as a probe for steric substituent effects in benzyl-type radicals †
作者:Waldemar Adam、Claus van Barneveld、Jan-Stefan Gerke、Frank Gerrit Klärner
DOI:10.1039/a905773k
日期:——
The zero-field splitting Dparameter of a set of ortho-substituted 1,3-diarylcyclopentane-1,3-diyl tripletdiradicals 3 has been determined by EPR spectroscopy in a 2-methyltetrahydrofuran glass matrix at 77 K. While for meta- and para-substituted tripletdiradicals 3 the Dparameter is only a function of the electronic nature (spin donor versus spin acceptor) of the substituent, for the ortho-substituted