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The Ligand Cap Affects the Coordination Number but Not Necessarily the Affinity for Anions of Tris-Bidentate Europium Complexes by Sheng-Yin Huang; Michelle Qian; Valérie C. Pierre is a Chemistry article available to read on EtoBox.

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To evaluate the effect of ligand geometry on the coordination number, number of inner-sphere water molecules, and affinity for anions of the corresponding lanthanide complex, six tris-bidentate 1,2-hydroxypyridonate (HOPO) europium(III) complexes with different cap sizes were synthesized and characterized. Wider or more flexible ligand caps, such as in Eu-TREN-Gly-HOPO and Eu-3,3-Gly-HOPO, enable the formation of nine-coordinate europium(III) complexes bearing three inner-sphere water molecules. In contrast, smaller or more rigid caps, such as in Eu-TREN-HOPO, Eu-2,2-Li-HOPO, Eu-3,3-Li-HOPO, and Eu-2,2-Gly-HOPO, favor eight-coordinate europium(III) complexes that have only two inner-sphere water molecules. Notably, there is no correlation between the number of inner-sphere water molecules and the affinity of the Eu(III) complexes for phosphate. Some = 2 (Eu-TREN-HOPO, Eu-3,3-Li-HOPO, and Eu-2,2-Gly-HOPO) and some = 3 (Eu-TREN-Gly-HOPO) complexes have no affinity for anions, whereas one = 2 complex (Eu-2,2-Li-HOPO) and one = 3 complex (Eu-3,3-Gly-HOPO) have a high affinity for phosphate. For the latter two systems, each inner-sphere water molecule is replaced with a phosphate anion,

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Author

Sheng-Yin Huang; Michelle Qian; Valérie C. Pierre

Publisher

American Chemical Society; American Chemical Society (ACS) (ISSN 0020-1669)

Published

2020

Language

EN

Field

Chemistry (Physical Sciences)