Fig. 6: The pressure response of ET, at low MQ+ concentrations, versus CPET, at high MQ+ concentrations.
a, The kinetic traces recorded at 550 nm for MQ•+ formation after pulsed laser excitation at 387 nm of 0.2 mM [Ru(bpy)2pyimH]2+ in the presence of the lowest MQ+ concentration of 1 mM in water/acetonitrile solution buffered at pH 6.7 (50 mM phosphate buffer) at 25 °C in the pressure range of 5–120 MPa. b, The pressure dependence of ln(kobs-ET) used to determine the activation volume for ET to MQ+, constructed on the basis of the data shown in a. c, The kinetic traces recorded at 550 nm for CPET after pulsed laser excitation at 387 nm of 0.2 mM [Ru(bpy)2pyimH]2+ in the presence of the highest MQ+ concentration of 100 mM in water/acetonitrile solution buffered at pH 6.7 (50 mM phosphate buffer) at 25 °C in the pressure range of 5–90 MPa. d, The pressure dependence of ln(kobs-CPET) used to determine the value of the activation volume for CPET, constructed on the basis of the data shown in c. The values of kobs (kobs-ET and kobs-CPET) obtained from the fit of experimental data to a single exponential function (Extended Data Figs. 3 and 4) as well as the parameters for the linear fits depicted in b and d are summarized in Extended Data Fig. 5 and Supplementary Table 3.1, respectively.
