A clear trend was observed with an increase in the number of heteroatoms in the system; the absorption maximum exhibited a progressive redshift.
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Stimuli-Responsive Thiele's Hydrocarbon Derivatives: Potential Inversion, Strong Electronic Coupling, and Influence of Brønsted/Lewis Acids and Bases.
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The calculation of the energy difference between the closed-shell singlet and open-shell triplet (Δ E CSS–OST ) state shows an increasing trend from 2 Ph to 2 Py to 2 Pz , indicating a progressive destabilization of the triplet state upon nitrogen doping ( Figure and Table S9 ).