Ladder-type semiconducting polymers are currently of broad interest in organic electronics. Their double-stranded architecture endows them with unique properties beneficial for charge transport and other properties, including minimal planar backbone, extended π-conjugation length, tight intermolecular contacts, low reorganizational energies, and excellent thermal and photochemical stability. Despite the benefits of this class of polymers, few examples of n-type semiconducting ladder polymers are known. Here, I report the synthesis and comprehensive characterization of phenazine-substituted derivative (BBL-P) of the well-known n-type ladder polymer poly(benzimidazobenzophenanthrolinedione) (BBL). BBL-P was obtained with an intrinsic viscosity of 0.7 dL/g. However, it has excellent film forming properties that allowed formation of freestanding films and characterization of optical, charge transport and mechanical properties. The field-effect electron mobility was 9.6 x10<sup>-5</sup> cm<sup>2</sup>/Vs, which is much lower than the parent BBL likely due to the lower intrinsic viscosity of BBL-P. Overall, the results demonstrate the use of BBL-P in organic electronic applications and provide insight into structure-property relationships of n-type semiconducting ladder polymers.

Synthesis and properties of phenazine substituted n-type semiconducting ladder polymer poly(benzimidazobenzophenanthrolinedione)

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