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Updated: May 9, 2026

Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
Published on: October 6, 2023
A Series of Solution-Stable Heterometallic Molecular Phosphonates with {Co9Dy}, {Co7Dy}, and {Co6Dy} Cores
Iaroslav Doroshenko1, Tomas Pokorny1, Lucie Simonikova1
1Department of Chemistry, Faculty of Science, Masaryk University, Kotlarska 2, Brno CZ-61137, Czech Republic.
Abstract:
A family of three heterometallic molecular phosphonate clusters with {CoxDy} (x = 6, 7, 9) cores was synthesized using the Schiff-base-derived phosphonate ligand HSAA2-. The reactions of CoCl2·6H2O and DyCl3·6H2O with HSAA2- under various conditions afforded the polynuclear complexes [Co9Dy(SAA)6Cl3] (1), [Na2Co7Dy(SAA)6(SA)] (2), and [Na3Co6Dy(SAA)6] (3), which are based on a common {Co6Dy} phosphonate core further stabilized by additional cobalt or sodium cations. The complexes were found to be thermally stable up to 250 °C, soluble, and stable in polar aprotic solvents. Direct current (dc) magnetic susceptibility measurements recorded over the temperature range 2-300 K were interpreted using an effective-spin model. The analysis revealed an isotropic Co2+ contribution and a strong axial Dy3+ response consistent with Ising-type magnetic behavior. Despite the presence of strongly anisotropic Dy3+ centers, alternating current (ac) magnetic measurements revealed negligible slow relaxation of magnetization, even under an external magnetic field.
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