Calculation of the exchange integral for short range intramolecular electronic energy transfer in bichromophoric molecules

A novel calculation of the exchange integral used for describing short range electronic energy transfer (EET) is presented. The calculation is applied to describe intramolecular EET in specially designed bichromophoric molecules. The results indicate that the simple Dexter exponential distance dependence, which is usually assumed to account for short range exchange interaction is valid in some limited cases. However, a more elaborate approach, such as presented here, is required in order to fully describe the molecular geometry effects on short range intramolecular EET.