Abstract
Conjugated polymers with alternating main chain structures of zinc porphyrin−furan (PZnPF) and zinc porphyrin−thiophene (PZnPT) have been synthesized by palladium(0)-catalyzed Stille coupling reaction. The optical, electrochemical, photophysical, and photovoltaic properties of PZnPF and PZnPT were investigated to elucidate the effects of the heterole bridges (i.e., furan vs. thiophene) in the porphyrin polymers. The optical bandgap of PZnPF (1.75 eV) is smaller than that of PZnPT (1.90 eV), implying the high delocalization of the π-electrons along the polymer main chain of PZnPF relative to PZnPT. The more extended π-conjugation in PZnPF results from the smaller steric repulsion of the meso-furan moiety with the porphyrin rings than that of the meso-thiophene. The time-resolved fluorescence spectrum of PZnPF showed a gradual Stokes shift to the longer wavelength in the subnanosecond time domain due to the relaxation from a twisted conformation with the large dihedral angles between the porphyrins and the ...
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
