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| - Photochemical Reaction of 2-Nitrobenzaldehyde by Monitoring the Diffusion Coefficient
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| Abstract
| - The photochemical reaction of 2-nitrobenzaldehyde (NBA) in various electrolyte solutions as well as in asolution with a protein is investigated from the viewpoint of the diffusion coefficient by using the time-resolved transient grating (TG) method. For studying reaction with optically silent materials such as electrolytes,we found that the diffusion coefficient is useful for identifying chemical species involved in the reaction. TheTG signal that represents the diffusion process was dramatically changed by adding electrolytes such as Cl-or Br-, and this result indicates that these electrolytes should participate in the photochemical reaction ofNBA. It was found that the time profile of the grating signal also depends on the addition of guanidine−HClor apomyoglobin. The structural change of the protein associated with the NBA reaction is discussed.
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