Photoinduced interfacial electron transfer (IET) in sulforhodamine B (SRhB) aminosilane-I in oxide (SnO2) nanoparticle donor-bridge-acceptor complexes has been studied on a single molecule and ensemble average level On both SnO2 and ZrO2, the sum of single molecule fluorescence decays agree with the ensemble average results suggesting complete sampling of molecules under single molecule conditions Shorter fluorescence lifetime on SnO2 than on ZrO2 is observed and attributed to JET from SRhB to SnO2 Single molecule lifetimes fluctuate with time and vary among different molecules, suggesting both static and dynamic IET heterogeneity in this system Computational modeling of the complexes shows a distribution of molecular conformation leading to a distribution of electronic coupling strengths and El rates It is likely that the conversion between these conformations led to the fluctuation of ET rate and fluorescence lifetime on the single molecule level