A regioregular π-conjugated alternating copolymer that contains fluorenone and bithiophene subunits forms self-organized polycrystals with meso- and nanoscopic structural features is imaged by low-current scanning tunneling microscopy. Unlike conjugated polymers lacking the fluorenone subunit (Figure, left), the rigidity of the copolymer discourages chain folding and results in “fold-free” monodomains (right).
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