Triads with Fullerene Components

The lifetime of D+.C.A produced by the sequential electron transfer increases as the distance between D+ and A increases. Porphyrin-imide-fullerene triads have been synthesised (Figure 12.11), with the three components separated by nonreactive spacer molecules. 

Similarly, the pyridyl fullerenes 30 and 31 also axially bind to ZnNcCBu)4 (28) to form supramolecular triads in which the zinc(II) naphthalocyanine acts as an electron donor, the pyridyl fullerenes act as primary electron acceptors, and either the ferrocene (Fc) or iV,iV-dimethylaminophenyl (DMA) moiety serves as a second electron donor [43], Fig. 2 shows the optimized structures of the resulting triads calculated by density functional theory (DFT), showing that the three components are arranged in a linear fashion. The binding constants of these systems (7.4 x 104M 1 for [ZnNc( Bu)4] 30 and 10.2 x 104M 1 for [ZnNc( Bu)4] 31 in o-dichlorobenzene) determined by UV-Vis spectroscopy are comparable with... 

So far, a variety of synthetic polychro-mophoric model systems, that is, triads, tetrads, pentads, and so on, have been studied in connection with photosynthesis and reported by several groups [70-88]. The electron-transport components, porphyrins, quinones, aromatic imides, and fullerenes are commonly employed by... 

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