New azulene derivatives containing resonantly electron withdrawing formyl and resonantly electron donating fluorine substituents on the seven- as well as the five-member ring have been prepared. Systematic color changes as a result of perturbation of HOMO, LUMO, and LUMO + 1 energies were discussed. Corresponding excited-state properties related to S 2 -fluorescence were determined.
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Shevyakov et al. (2003) studied this question.
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