Supramolecular Control of Charge Transport in Molecular Wires
journal contributionposted on 07.11.2007, 00:00 by Ferdinand C. Grozema, Coralie Houarner-Rassin, Paulette Prins, Laurens D. A. Siebbeles, Harry L. Anderson
The transport of positive charges along porphyrin-based molecular wires has been probed in dilute solution using pulse radiolysis time-resolved microwave conductivity. The mobility of positive charges along isolated single-strand porphyrin wires was found to be 0.084 cm2/(V s). Addition of 4,4‘-bipyridyl leads to the formation of a double-strand ladder complex, locking each polymer strand into a more planar structure and thus enhancing the porphyrin−porphyrin π-conjugation, leading to an increase in the charge carrier mobility by an order of magnitude to 0.91 cm2/(V s).