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Issue 23, 2019
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Inducing selectivity and chirality in group IV metal coordination with high-denticity hydroxypyridinones

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Abstract

The solution- and solid-state interactions between the octadentate siderophore mimic 3,4,3-LI(1,2-HOPO) (343HOPO) and group IV metal ions were investigated using high-resolution mass spectrometry, liquid chromatography, UV-visible spectrophotometry, metal-competition batch titrations, and single crystal X-ray diffraction. 343HOPO forms a neutral 1 : 1 complex, [HfIV343HOPO], that exhibits extreme stability in aqueous solution, with a log β110 value reaching 42.3. These results affirm the remarkable charge-based selectivity of 343HOPO for octacoordinated tetravalent cations with a Hf(IV) complex 1021 more stable than its Lu(III) analogue. Moreover, [HfIV343HOPO] and its Zr(IV) counterpart show exceptional robustness, with the ligand remaining bound to the cation over a very broad pH range: from pH ∼ 11 to acidic conditions as strong as 10 M HCl. In stark contrast, Ti(IV)-343HOPO species are far less stable and undergo hydrolysis at pH as low as ∼6, likely due to the mismatch between the preferred hexacoordinated Ti(IV) ion and octadentate 343HOPO ligand. The extreme charge-based and denticity-driven selectivity of 343HOPO, now observed across the periodic table, paves the way for new selective sequestration systems for radionuclides including medical 44Ti, 89Zr or 177Lu/Hf isotopes, toxic polonium (Po) contaminants, as well as rutherfordium (Rf) research isotopes. Furthermore, despite the lack of a chiral center in 343HOPO, its complexes with metal ions are chiral and appear to form a single set of enantiomers.

Graphical abstract: Inducing selectivity and chirality in group IV metal coordination with high-denticity hydroxypyridinones

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Article information


Submitted
08 Mar 2019
Accepted
02 May 2019
First published
16 May 2019

Dalton Trans., 2019,48, 8238-8247
Article type
Paper
Author version available

Inducing selectivity and chirality in group IV metal coordination with high-denticity hydroxypyridinones

G. J.-P. Deblonde, T. D. Lohrey and R. J. Abergel, Dalton Trans., 2019, 48, 8238
DOI: 10.1039/C9DT01031A

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