Making a Molecular Wire: Charge and Spin Transport through para-Phenylene Oligomers

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• 作者：Emily A. Weiss ; Michael J. Ahrens ; Louise E. Sinks ; Alexey V. Gusev ; Mark A. Ratner ; and Michael R. Wasielewski
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：May 5, 2004
• 年：2004
• 卷：126
• 期：17
• 页码：5577 - 5584
• 全文大小：153K
• 年卷期：v.126,no.17(May 5, 2004)
• ISSN：1520-5126

文摘

Functional molecular wires are essential for the development of molecular electronics. Chargetransport through molecules occurs primarily by means of two mechanisms, coherent superexchange andincoherent charge hopping. Rates of charge transport through molecules in which superexchange dominatesdecrease approximately exponentially with distance, which precludes using these molecules as effectivemolecular wires. In contrast, charge transport rates through molecules in which incoherent charge hoppingprevails should display nearly distance independent, wirelike behavior. We are now able to determine howeach mechanism contributes to the overall charge transport characteristics of a donor-bridge-acceptor(D-B-A) system, where D = phenothiazine (PTZ), B = p-oligophenylene, and A = perylene-3,4:9,10-bis(dicarboximide) (PDI), by measuring the interaction between two unpaired spins within the system'scharge separated state via magnetic field effects on the yield of radical pair and triplet recombination product.