Specific Aspects of Photoinduced Electron Transfer in Organic -Conjugated Systems

3 Specific Aspects of Photoinduced Electron Transfer in Organic 7i-Conjugated Systems 

In previous chapters, detailed theoretical principles of CT processes in general and photoinduced CT processes in particular have been provided. The next step is the practical application of these principles to systems which will be discussed within the scope of this thesis, namely organic -conjugated donor-acceptor supramo-lecular assemblies. Furthermore, we will draw our attention to CT processes, which are triggered by photochemical stimuli. They provide the theoretical background, which is required to understand the charge-transport properties of wire-type molecular bridges. 

Photoinduced charge-transfer reactions have been extensively investigated in many fields of science for more than 15 years. Especially, in the now fast-developing field of photovoltaics it is of fundamental interest to understand the photophysics and photochemistry of excited states in organic molecules [61]. Photosynthetic energy conversion in green plants serves herein as the ultimate prototype [62]. 

As already outlined in the previous parts, the basic description of photoinduced charge transfer between a donor D and an acceptor A considers different steps. For the following discussion we will assume the following reaction sequence  

Alternatively, we can formulate a hole transfer from an excited acceptor onto a donor. In general, A and D should be either covalently linked (intramolecular CT) 

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