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A series of n-type hexaazatriphenylene derivatives were synthesized by condensation coupling of 1,2-diamines and 1,2-diketones. The study of their photophysical and electrochemical properties showed that their lowest unoccupied molecular orbital (LUMO) energy levels could be effectively tuned from -3.54 to -4.02 eV simply by increasing the number of pyrazine units in their molecular structures.
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Wang et al. (2011) studied this question.
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