Synthesis and Spectroscopic Properties of the Elusive 3a,9a-diazaperylenium Dication
The 3a,9a-diazaperylenium dication (1) was synthesized for the first time in two steps from p-phenylene diamine. Ab initio calculations show a twisted ground state with a 6.4° tilt between the two quinolizinium building blocks. Dication 1 is photoluminescent in fluid solutions of H2O, CH3CN, and CH3NO2, but not in rigid matrices of the same solvents. This phenomenon has been attributed to a geometric relaxation of the tilted ground state into an emitting planar lowest singlet excited state.
L. Sotiriou-Leventis et al., "Synthesis and Spectroscopic Properties of the Elusive 3a,9a-diazaperylenium Dication," Organic Letters, American Chemical Society (ACS), Oct 2002.
The definitive version is available at https://doi.org/10.1021/ol0268687
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