[Cr](Cl)(Cl)(=O)=O.[Cl-].[Dy+3].[Cl-].[Cl-].[C:10]([CH2:13][N:14]1[CH2:25][CH2:24][NH:23][CH2:22][CH2:21][N:20]([CH2:26][C:27]([OH:29])=[O:28])[CH2:19][CH2:18][N:17]([CH2:30][C:31]([OH:33])=[O:32])[CH2:16][CH2:15]1)([OH:12])=[O:11].[Bi+3]>[Cl-].[Mn+2].[Cl-]>[C:10]([CH2:13][N:14]1[CH2:25][CH2:24][NH:23][CH2:22][CH2:21][N:20]([CH2:26][C:27]([OH:29])=[O:28])[CH2:19][CH2:18][N:17]([CH2:30][C:31]([OH:33])=[O:32])[CH2:16][CH2:15]1)([OH:12])=[O:11]Four hundred fifty μl of 100mM solutions of each of chromic chloride, ferric chloride, manganese chloride and dysprosium chloride were mixed with 50 μl of 1M 1,4,7-triscarboxymethyl-1,4,7,10tetraazacyclododecane and adjusted to pH 4.5. The solutions were heated at 88° C. for 20 minutes to enhance the rate of chelation, cooled and then adjusted to pH 7.
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