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. Author manuscript; available in PMC: 2009 Jan 1.
Published in final edited form as: J Magn Reson. 2007 Oct 5;190(1):7–25. doi: 10.1016/j.jmr.2007.09.020

Figure 7.

Figure 7

Positively charged TEMPO-choline. Values plotted as in Figure 6. Positive voltage at the nitroxyl oxygen enhances the interaction with Fe(CN)63- based on the much larger relaxation rates in column A. The loss in inhomogeneous broadening in column B is also much greater and the quadratic curvature of half-saturation power P1/2 is column C is much more pronounced. The weaker interaction of Ru(NH3)63+ is associated with more divergence from linearity near zero PRA concentration for both linewidths. The half-saturation power curves matched from lineshape results reflect the divergence in interactions, being multiplied by 1.16, 1.27 and 1.29 for added Fe(CN)63-, NiEDDA0 and Ru(NH3)63+ respectively, as expected based on the effect of more to less spin exchange on the prominence of splitting.