Hexaazatriphenylene Derivatives with Tunable Lowest Unoccupied Molecular Orbital Levels.

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. [ABSTRACT FROM AUTHOR]