The structure of H5DTPA (see Box 4.3) is shown below:
(a) Write equilibria to show the stepwise acid dissociation of H5DTPA. Which step do you expect to have the largest value of Ka
(b) In the complex [Gd(DTPA)(OH2)]2-, the Gd3+ ion is 9-coordinate. Draw a diagram that illustrates how the DTPA5- ion binds to the metal centre in this complex. How many chelate rings are formed?
(c) Values of log K for the formation of [M(DTPA)n+ complexes in aqueous media are as follows: Gd3+, 22.5; Fe3+, 27.3; Ag1, 8.7. Comment on these data.
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