[C:1]([CH2:4][C:5](=[O:7])[CH3:6])(=[O:3])[CH3:2].[OH-].[NH4+].[CH3:10]/[C:11](/[O-:16])=[CH:12]/[C:13]([CH3:15])=[O:14].[Cl-].[Gd+3:18].[Cl-].[Cl-]>O>[CH3:6]/[C:5](/[O-:7])=[CH:4]/[C:1]([CH3:2])=[O:3].[CH3:10]/[C:11](/[O-:16])=[CH:12]/[C:13]([CH3:15])=[O:14].[CH3:6]/[C:5](/[O-:7])=[CH:4]/[C:1]([CH3:2])=[O:3].[Gd+3:18]Gadolinium acetylacetonate (GdAcAc) was prepared using the method as previously described by Nijsen et al. for holmium acetylacetonate [2-3]. Briefly, 166 g of acetylacetone was dissolved in 1 l of distilled water. The pH of the acetylacetone solution was then adjusted to 8.50 by addition of ammonium hydroxide, thereby ionising the acetylacetone to acetylacetonate. 10 g of gadolinium chloride was dissolved in 40 ml of distilled water and added to the acetylacetonate solution, followed by gentle stirring. The solution was then left to stand overnight at room temperature. The crystals were collected by centrifugation (2 000 rpm for 2 min), washed 4 times with distilled water and dried in two steps: first overnight at room temperature, then overnight at 50° C.
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