Table 3.

Charged-to-neutral PRA (NiEDDA⁰) R₁ relaxivity ratios and corresponding voltages indexed by charged PRAs indexed as in Table 2. Voltages distorted by short ranges forces, as specified in the text, are given in parentheses.

Experiment	± PRA	$\frac{{\chi }_1^{\pm }}{{\chi }_1^0}$	$\mid \ln \frac{{\chi }_{-}^1}{{\chi }_1^{+}}\mid$	V [mV]
tempone	Cr	2.85		+1.5
tempone	Fe	1.08	0.24	(−1.9)
	Ru	1.37		+1.0
IASL	Fe	2.58	0.63	+5.5
	Ru	1.37		+1.0
IAPCPSL	Cr	2.11		−1.0
	Fe	1.04	0.47	−2.2
	Ru	1.67		−0.7
ASL-cys-allyl	Fe	1.70	0.09	+2.0
	Ru	1.55		+0
ASL-cys-methyl	Fe	1.70	0.15	+2.0
	Ru	1.46		+0.5
deuterated tempone	Cr	2.70		+1.1
	Fe	1.79	0.24	+2.4
	Ru	1.41		+0.7
TEMPO choline (+1)	Fe	7.12	2.1	+14.2
	Ru	0.87		+4.9
carboxy TEMPO (−1)	Fe	0.30	2.1	−12.9
	Ru	2.6		−4.5
MSL-PEG column	Fe	2.4	0.38	+4.9
	Ru	0.91		+4.5
ASL-S1	Cr	1.1		(−6.6)
	Fe	2.0	0.36	3.4
	Ru	1.4		0.8