Dispersive XAFS study on the laser-induced reduction of a Rh ion complex in a HO/EtOH solution

Saeki, Morihisa*; Matsumura, Daiju   ; Nakanishi, Ryuzo*; Yomogida, Takumi   ; Tsuji, Takuya  ; Saito, Hiroyuki*; Oba, Hironori*  

The reaction mechanism of the direct photo-reduction of a Rh ion complex to a Rh species was studied using dispersive X-ray absorption fine structure spectroscopy. The time-resolved X-ray absorption near edge structure (XANES) showed the absence of isosbestic points. It suggested that more than two Rhn+ species contribute toward the reaction. We applied singular value deposition to the time-resolved XANES data and showed the contribution of three Rh species to the direct photoreduction. Next, in order to extract spectral information on the Rh intermediate, we analyzed the time-resolved XANES data using multivariate curve resolution analysis, which gives pure spectra and concentration profile of the Rh species. Finally, based on feature of the pure spectrum, we assigned the Rh intermediate to the Rh species.