Fig. 1: 2,5-Bis(aryl)-pyrrolo[3,2-b]pyrroles bearing nitro groups at para-, meta-, and ortho- positions respectively.
From: Deciphering the unusual fluorescence in weakly coupled bis-nitro-pyrrolo[3,2-b]pyrroles
a Structures of 2,5-bis(nitrophenyl)-1,4-dihydropyrrolo[3,2-b]pyrroles. b Structures of 2,5-bis(nitro-[1,1′-biphenyl]-4-yl)-1,4-dihydropyrrolo[3,2-b]pyrroles.
