New Processable Phenanthridinone‐Based Polymers for Organic Solar Cell Applications

DOI: 10.1002/aenm.201502094 anionic form under the alkylation conditions. This same trend was observed for the alkylation of pyrido[2,3,4,5lmn ]phenanthridine under basic conditions. [ 24 ] Owing to the different functional groups, M1 and M2 can be easily separated on a chromatographic column or purifi ed by recrystallization. To obtain low band gap and processable materials, these monomers were copolymerized with 2,5-bis(2-octyldodecyl)-3,6-di(thien-2-yl)pyrrolo[3,4c ]pyrrole1,4-dione ( M3 ) (see the Supporting Information). [ 25 ]

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