3/10/2024 0 Comments Obs download 21.1.1![]() ![]() ![]() While the octadentate ligand 3,4,3-LI(1,2-HOPO) ( 1, Fig. ![]() 1, 5 The backbone geometry of the ligand must affect the thermodynamic stability and photophysical properties of the corresponding Ln- and An-complexes, but this has not been investigated in a systematic way. Octadentate ligands, each incorporating four 1,2-HOPO functionalities, are known to strongly bind Ln(III), An(III), and An(IV) and to act as antennae that sensitize the emission of Eu(III). 4 The coordination chemistry properties of these ligands can be fine-tuned by systematic modifications of the denticity, geometry and acidity of the backbone. The 6-amide derivative of 1-hydroxy-pyridin-2-one (1,2-HOPO) has been linked to multiple polyamine scaffolds through amide coupling, to form multidentate ligand structures used for a variety of applications such as actinide (An) and iron chelation, 1, 2 MRI contrast enhancement 3 and lanthanide (Ln) luminescence sensitization. The high-affinity bidentate hydroxypyridonate (HOPO) metal-chelating groups are related to microbial siderophores: they combine the structural features of hydroxamic acids with the electronic properties of catechols. ![]()
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