1) Gd-DOTA complex is suitable for MRI because A) DOTA is a fluorescence ligand
ID: 103162 • Letter: 1
Question
1) Gd-DOTA complex is suitable for MRI because A) DOTA is a fluorescence ligand making the complex highly luminescent. B) DOTA is a multidentate ligand making the complex more stable C) Gd has unpaired electrons making it highly magnetic D) A and B E) B and C 2) Which is NOT a characteristic of a lanthanide complex? A) Lanthanide complexes exhibit larger crystal field splitting with phenanthroline ligands B) A typical coordination number of a lanthanide complex is 8 or 9 C) Lanthanide metals like Lewis basic oxygen donor ligands D) Lanthanide complexes can have large number of unpaired electrons E) Lanthanide complexes prefer O-donor ligands over N-donor ligandsExplanation / Answer
E) B and C is the correct option
MRI or magnetic resonance imaging requires the usage of highly paramagnetic contrast agents to distinguish the tissues meant for diagnosis from other.Gd-DOTA is used as an MRI CA due to its very high paramagnetic efficiency at even a low magnetic field strength.
Also,it is a highly stable complex ,due to macrocyclic nature of DOTA ligand.with a very high stability constant value.
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