Polyazaacenes: New tricks for old dogs
Date
1999Source
Pure and Applied ChemistryVolume
71Issue
2Pages
295-302Google Scholar check
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The evolution of heterocycles from hexaazaanthracene to tetraazapentacenes led to the discovery that syn aza-substituted polyazaacenes possess unusual zwitterionic structures. One of these, 5,7-diphenyl-5H,12H-quinoxalino[2,3-b]phenazine 4, first claimed in 1898 was fully characterized, including an X-ray crystal structure. These heteroacenes have a low calculated singlet-triplet gap and have unusual photophysical properties. ©1999 IUPAC.