Abstract
Density functional theory calculations for p-Br-N-sulfinylaniline and m-nitro-N-sulfinylaniline in the ground singlet (S0) and triplet (T1) excited states are presented and analyzed in terms of their specific physicochemical properties. As all aromatic N-sulfinylamines, these compounds are rather unstable being sensitive to moist air and we assign this instability to the thermally allowed S0T1 excitation induced by internal magnetic forces. Our calculations indicate that the T1–S0 energy gap in these molecules is unexpectedly low and spin-orbit coupling matrix element between these states is relatively high, being allowed by the orbital symmetry selection rules. We also apply the exchange mechanism of spin-catalysis concept in order to explain the prone of N-sulfinylamines to the Diels-Alder cycloaddition with dienes.
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