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M-BR difference spectra in the carbonyl region. Experiments were performed in H2O (upper seven spectra) and in 2H2O (D2O; lower three spectra) at the indicated pH and pD, respectively. The dotted vertical line indicates that the C⩵O stretching vibration of D85 is shifted to higher wavenumbers at acidic pH as compared with neutral and alkaline pH. The corresponding band at pD 4.4 is analogously shifted.
