Dendritic and linear macromolecular architectures for photovoltaics: a photoinduced charge transfer investigation

Dendrimers have been previously shown to provide significant advantages in both excited-state energy transfer and charge transfer. However, this architecture causes one of the charges to be encapsulated and thus not available for charge separation over long distances. We conceived dendron-rod-coils as scaffolds that could have the architectural advantage of the dendrimers, while still providing a possible conduit for charge separation. In this study, we have designed and synthesized dendron-rod-coil-based donor-chromophore-acceptor triads and have compared these with dendron-rod and rod-coil diads. We have then evaluated the relative abilities of these molecules in photoinduced charge transfer. Our studies reveal that dendron-rod-coil could indeed be the ideal architecture for efficient photoinduced charge separation.