| Autor: |
Adam, Waldemar, Barneveld, Claus van, Emmert, Oliver |
| Zdroj: |
Journal of the Chemical Society, Perkin Transactions 2; April 1, 2000, Vol. 2000 Issue: 4 p637-641, 5p |
| Abstrakt: |
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 > vinyl > 2-naphthyl > phenyl. Good linear correlations of the D values have been obtained with the reported hyperfine coupling constants (α-hfc), with the ab initio (B3LYP) spin densities for the corresponding monoradicals 3, and with the radical stabilization energies (RSE). The present results for these extended π systems are compared with those for previously reported heteroaryl-substituted triplet diradicals. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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