Electron-transfer reactions binding modes

The above-mentioned theoretical background shows that, irrespective of the chemical nature of the photosensitizer and its binding mode to the semiconductor surface, one should consider two main ways of the semiconductor CB populating direct and indirect. Direct processes include VB -> CB excitations, photosensitization via bulk doping (TTRS-driven processes) and photophysical processes involving the TTRMs term. Indirect processes, in turn, involve excitation of the surface and a subsequent electron transfer reaction (WRV1 + TTet). 

One of the most important and impressive applications of transient RR and TR studies deals with investigation of the strutural dynamics and mechanism of action of the terminal oxidase in aerobic respiration namely, cytochrome-c oxidase (CcO). In contrast to the previous section which dealt with the dynamics involved in protein structural rearrangements, the following TR studies to be summarized for CcO deal with the detection and characterization of the complex, multistep proton and electron transfer reactions which follow O2 binding by CcO. Whereas in the case of Hb structural dynamics the essential data consist of frequency shifts of key modes, the TR spectra acquired during the multistep redox reaction involved in CcO function reveal several distinct sets of transient spectral features which are characteristic of specific intermediates. The... 

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