Oligo-Phenylene Vinylene A Model System for Donor-Acceptor Interactions

6 Oligo-Phenylene Vinylene A Model System for Donor—Acceptor Interactions 

In the previous section an attempt was made to explain the occurrence of such efficient charge transfer by the outstandingly fast kinetics of this process. However, it is clear that intimate mixing and close contact of the p- 

3 It is instructive to point out that while OPV1-C60 is the smallest member of the homologous series of OPVn-Ceo dyads, it lacks a vinylene bond and is therefore formally not an oligo(p-phenylenc vinylene)-Ceo derivative. 

Before describing the photoexcitations of the OPVn- Cfi() dyads and the OPVn/MP-Cgo mixtures in solution, the photophysical properties of the individual reference compounds (OPVn and MP Coo) are briefly discussed. 

Photoexcitation of OPVn in Solution. The photoexcitations of oligo(p-phenylene vinylene)s (OPVns, n = 2-7) [106] can be summarised as follows. The singlet excited state OPVn(5i) decays radiatively or non-radiatively to the ground state and via intersystem crossing to the OPVn(Ti) triplet state. The singlet excited state lifetimes t have been determined for OPV3 (r = 

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