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Excimer-Mediated Intermolecular Charge Transfer in Self-Assembled Donor-Acceptor Dyes on Metal Oxides.

08:00 EDT 16th May 2019 | BioPortfolio

Summary of "Excimer-Mediated Intermolecular Charge Transfer in Self-Assembled Donor-Acceptor Dyes on Metal Oxides."

When conjugate molecules are self-assembled on the surface of semiconductors, emergent properties resulting from the electronic coupling between the conjugate moieties are of importance in the interfacial electron transfer dynamics for photoelectrochemical and optoelectronics devices. In this work, we investigate the self-assembly of the triphenylamine-oligothiophene-perylenemonoimide (PMI) molecules, denoted as BH4, on metal oxide surfaces via UV-Vis absorption, photoluminescence, transient near-infrared absorption spectroscopies, and molecular dynamic simulations, and report the excimer formation due to the π-π interaction of the PMI units between the neighboring dye molecules. To our best knowledge, this is the first experimental observation of intermolecular excimer formation when conjugate donor-acceptor molecules form a self-assembled monolayer (SAM). In addition, a long-lived (4.3μs) intermolecular charge separation is observed, and a new excimer-mediated intermolecular charger transfer (EMI-CT) mechanism is proposed. This work demonstrates that through the design of dye molecules, the excited complexes or aggregates can provide a pathway to slow down the recombination rate in photoelectrodes that utilize donor-acceptor dyad molecules.

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This article was published in the following journal.

Name: Journal of the American Chemical Society
ISSN: 1520-5126
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