Many substituted indacenes have been synthesized due to their interest as model antiaromatic compounds. The excitedstate properties of tBu-substituted s-indacenes have been studied in great detail. Recently, a number of phenylsubstituted indacenes were reported. Several donor-substituted s-indacenes were synthesized in the 1970s and 1980s, including 4,8-dimethylamine substituted analogues like the ones we report to have inverted gaps here. Among many synthesized hetero-sindacenes, we find that a diphospa-s-indacene has a negative E(S 1 -T 2 ) similar to that in D 2h s-indacene. The variety and tunability offered by the s-indacene motif holds great promise for the future design of inverted gap emitters.