The results have shown  that the process of BIIB021 cannot be neglected in the solutions studied as the relative contribution of the diffusion accelerated nonradiative energy transfer to the total drop of the quantum yield can be even higher than 70%. In the examined solutions an additional channel of deactivation for the excitation energy takes place, which can be identified as partial degradation of excitation energy during its migration between the monomers. This hypothesis seems justified because of the good agreement between experimental data and theoretical results given by Eq. (30) for α0 = 0.4 for the Smoluchowski boundary conditions (SBC) as well as for α0 = 0.3 for the reflecting boundary condition (RBC) (Fig. 6).
Fig. 6. Comparison of the monomer fluorescence quantum yield predicted by Eq. (30) with experimental data (●) obtained for FMN in aqueous solution at 298.2 K. The blue and red lines represent the cases of SBC and RBC, respectively.Figure taken from Ref.  with permission from Elsevier. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)Figure optionsDownload full-size imageDownload as PowerPoint slide