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Photooxidative Polymerization of Pyrrole from Photosystem I Proteins

Joshua M. Passantino,A. M. Williams,M. Nabhan,D. Cliffel,G. Jennings

Published 2022 in ACS Applied Polymer Materials

ABSTRACT

The photosystem I (PSI) protein complex is increasingly being utilized because of its robust photoelectrochemical properties. The oxidative ability of the P700 reaction site of the protein is less studied than the reductive capabilities of the FB reaction site. As shown herein, the oxidation potential of P700 is robust enough to initiate an oxidative polymerization of the redox monomer, pyrrole. This manuscript reports the first photoactive and conductive protein−polymer composite using extracted, unmodified PSI protein to perform the polymerization process. The polymerization technique consists of adding a monomer and a dopant to a solution of PSI and illuminating the sample with simulated sunlight. Successful polymerization of pyrrole from PSI is confirmed by the combination of infrared spectroscopy, visual observation, thermogravimetric analysis, contact angle measurements, and conductivity measurements. A stable composite between the protein and polymer is indicated by SDS−PAGE and is further supported by photoelectrochemical properties that are opposite in current and potential from those of PSI alone.

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