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. 2015 Mar 13;373(2037):20140182. doi: 10.1098/rsta.2014.0182

Figure 18.

Figure 18.

The intravenous MRI contrast agent [Gd(DTPA)(H2O)]2−. The paramagnetic 4f7 Gd3+ ion is large (ionic radius 1.2 Å) and can accommodate eight coordinating atoms from the chelating DTPA ligand and a water molecule. Exchange of coordinated water with bulk water is important for producing contrast in the magnetic resonance image.