Formation of Heteropolynuclear Lanthanide Complexes
Using Macrocyclic Phosphonated Cyclam-Based Ligands
Posted on 2020-07-08 - 20:06
Ligands L1 and L2, respectively based on a cyclam and a cross-bridged
cyclam scaffold functionalized at N1 and N8 by 6-phosphonic-2-methylene
pyridyl groups, are described. While complexation of lanthanide (Ln)
cations with L2 was not possible,
a family of complexes has been prepared with L1, of the general formulae [LnL1H2]Cl (Ln3+ = Lu,
Tb, Yb) or [LnL1H] (Ln3+ = Eu). The solution, structural, potentiometric, and photophysical
data for these novel ligands and their complexes have been investigated,
including a solid-state study by X-ray diffraction (L1, L2, and [EuL1H]), 1H NMR complexation investigations (Lu3+), as well as UV–vis
absorption and luminescence spectroscopy in water and D2O (pH ≈ 7). L1 forms
1:1 metal–ligand stoichiometric octadentate complexes in solution.
Importantly, the pyridyl phosphonate functions are capable of simultaneous
chelation to the metal center and of interaction with a second metal
center. 1H NMR (Lu3+) and spectrophotometric
titrations of the isolated [TbL1]− complex by EuCl3 salts demonstrated
the formation of high-order (hetero)polymetallic species in aqueous
solution (H2O, pH = 7). Global analysis of the luminescence
titration experiment points to the formation of 4:1, 3:1, and 3:2
[TbL1]/Eu heteropolynuclear assemblies,
exhibiting a strong preference to forming [TbL1]3Eu2 at increased europium concentrations,
with energy transfer occurring between the kinetically inert terbium
complex and added europium cations.
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Knighton, Richard C.; Soro, Lohona K.; Troadec, Thibault; Mazan, Valerie; Nonat, Aline M.; Elhabiri, Mourad; et al. (2020). Formation of Heteropolynuclear Lanthanide Complexes
Using Macrocyclic Phosphonated Cyclam-Based Ligands. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.0c01456