Solution processable higher dimensional π-conjugated polymers are highly desirable in materials science. Solution processability provides synthetic control over the polymer structure and hence optoelectronic and electronic properties of the polymer. Conjugated microporous polymers (CMPs) are intrinsically porous and have π-conjugated network spanned in three dimensions. As CMPs are a unique combination of porosity and extended π-conjugation, they are potentially useful in catalysis, light harvesting, semiconducting, sensing, storage, and sieving applications Currently, solution processable CMPs are mostly generated utilizing mini-emulsion technique in which surfactants are used to generate water dispersible CMP nanoparticles. However, there is no molecular level control of solubility and hence no control over the network formation. Moreover, surfactants can negatively impact the optical and electronic properties of the CMPs. Thus, there is a need for imparting solubility at the molecular level to gain control over the CMP growth. Recently, we have shown that the cycloalkyl straps can efficiently block the π-face of the phenyl repeat unit, prevent inter-polymer π-π stacking interactions and render soluble high molecular weight polymers (ca. 24 kDa). In this poster, I will discuss the use of molecular level sheathing/strapping approach for generating solution processable CMPs. Also, the impact of molecular strapping on the CMPs optical properties, porosity, morphology, dye adsorptivity, and charge mobility will be studied and compared with the control CMP.

Strapped conjugated microporous polymers

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ACS Fall 2022

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