Abstract
Electron donor-acceptor (D-A) interactions have been the subject of intense scrutiny by the scientific community due to their role in a variety of applications, such as solar energy production, photocatalysis, and stimulus-responsive materials. We chose porphyrins and fullerenes for our fundamental studies of D-A interactions, as they are the prototypical D-A pair by virtue of their well-positioned energy levels, low reorganization energies, and the high extinction coefficients of the porphyrin ring in the visible region. Moreover, they give us the opportunity to not only choose between different bound or endohedral metal ions or clusters, but also to connect them in different ways in order to tune their behavior. We have used time-resolved spectroscopic techniques, including transient absorption, fluorescence upconversion, and time-correlated single-photon counting, to untangle charge separation and recombination dynamics upon donor excitation in the femto- to nanosecond regime to gain additional insight into the relationship between structure and behavior.
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