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An ambient stable pyreno[4,5- b ]pyrrole monoanion and pyreno[4,5- b :9,10- b ′]dipyrrole dianion have been isolated and characterized, showing a low energy intense absorption band with the absorption coefficient reaching 7.1 × 10 4  dm 3  mol −1  cm −1 .

chemical science

Facile synthesis of an ambient stable pyreno[4,5-b]pyrrole monoanion and pyreno[4,5-b:9,10-b′]dipyrrole dianion: from serendipity to design