Electronic structure of the two dehydro-meta-xylylene triradicals and their derivatives

T. Wang and A. I. Krylov
Chem. Phys. Lett. 426, 196 – 200 (2006)

The ground and low-lying excited states of the 5-dehydro-meta-xylylene and 2-dehydro-meta-xylylene triradicals, as well as their derivatives are characterized by the equation-of-motion spin-flip coupled-cluster method with single and double substitutions. The effect of substituents in the C2, C4, and C6 positions on electronic states ordering is investigated. In the 5-dehydro-meta-xylylene triradical, which has the 1²B₂ ground state, charged substituents at C2 stabilize the closed-shell 1²A₁ state, whereas the NO substituent lowers the 1²A₂ and 1²B₁ states. In the 2-dehydro-meta-xylylene triradical with the 1⁴B₂ ground state charged substituents also significantly stabilize the 1²A₁ and 1²B₁ states. The observed effects are explained by the nodal structure of the π-orbitals and charge localization in the σ-radical center.

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