Heterobimetallic metallacrown of EuIIICuII5 with 5-methyl-2-pyrazinehydroxamic acid: Synthesis, crystal structure, magnetism, and the influence of CuII ions on the photoluminescent properties

Paiva, Fábio F.; Ferreira, Leonildo Alves; Rosa, Iara M. L.; Silva, Rafaela M. R. da; Sígoli, Fernando Aparecido; Alves, Odivaldo C.; García, F.; Guedes, Guilherme P.; Marinho, Maria Vanda

doi:10.1016/j.poly.2021.115466

Cited by 4 publications

(1 citation statement)

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“…This is because it is widely recognized that factors such as temperature, molar ratio of reagents, geometric characteristics, and coordination sites of the organic ligands 27–30 can have a significant impact on crystal growth. Moreover, the choice of synthetic strategies, such as stirring, 9,31 diffusion, 32 solvothermal (particularly when mixed organic solvents are employed), 8 and hydrothermal (used when water is the only solvent), 22,33 can also influence the process. Regarding the synthetic approach, it is noteworthy that the solvothermal method is more commonly employed compared to the hydrothermal one for the rational design and synthesis of coordination compounds derived from H 4 bttb or H 2 -2,5pzdc acids (as indicated in Table S1†).…”

Section: Resultsmentioning

confidence: 99%

Intensity and lifetime ratiometric luminescent thermometer based on a Tb(iii) coordination polymer

Costa,

da Silva,

Botelho

et al. 2024

Dalton Trans.

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Section: Resultsmentioning

confidence: 99%

Intensity and lifetime ratiometric luminescent thermometer based on a Tb(iii) coordination polymer

Costa,

da Silva,

Botelho

et al. 2024

Dalton Trans.

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Isomorphic oxamate derivatives triple mesocates: From the synthesis to antibacterial activities

Francescon,

de J Pfau,

Borth

et al. 2025

Journal of Molecular Structure

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Metallacrown of CeIIICuII5: Synthesis, Structural Characterization and Insights for Nanoparticles

Tempesta,

Paiva,

Ferreira

et al. 2024

Magnetochemistry

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The heterobimetallic 15-MC-5 metallacrown of formula [CeCu5(5mpzHA)5(NO3)(H2O)7]·2NO3·7H2O, designated MC-Ce, was synthesized using 5-methyl-2-pyrazinehydroxamic acid (5mpzHA) as a linker, reacting with CeIII and CuII salts under mild conditions. Single-crystal X-ray diffraction analysis reveals a crown-like [Cu5Ce(5mpzHA)5] core, characteristic of a 15-MC-5 system, with five CuII atoms at the rim of the crown and the CeIII ion occupying the dome of the crown, with water molecules, oxygen atoms and one nitrate anion filling the nine-coordination sphere around the CeIII ion, which exhibits a distorted spherical tricapped trigonal prism geometry. The thermogravimetric analysis evidences successive mass losses due to the removal of water molecules and decomposition of the structure after 217 °C, whereas the PXRD analysis of the thermal decomposition residue reveals the presence of copper and copper/cerium oxide particles. These nanocomposite materials were also synthesized using the metallacrown MC-Ce under a hydrothermal method in the presence of multi-walled carbon nanotubes (MWCNTs), affording insights that this metallacrown can act as a source precursor for the synthesis of these mixed cerium/copper oxide nanomaterials. The experimental χMT value in MC-Ce at room temperature is 3.175 cm3 mol−1 K, which is higher than the calculated one for one magnetically isolated CeIII plus five CuII ions, probably due to the antiferromagnetic interactions among CuII ions within the metallacrown hoop plus the thermal depopulation of JZ sublevels of CeIII ground state (5/2), which exhibit a small splitting under the anisotropic ligand field effects. The χMT decreases continuously until it reaches the value of 0.80 cm3 mol−1 K at 10 K, reinforcing the presence of intramolecular antiferromagnetic interactions.

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Heterobimetallic metallacrown of EuIIICuII5 with 5-methyl-2-pyrazinehydroxamic acid: Synthesis, crystal structure, magnetism, and the influence of CuII ions on the photoluminescent properties

Cited by 4 publications

References 53 publications

Intensity and lifetime ratiometric luminescent thermometer based on a Tb(iii) coordination polymer

Intensity and lifetime ratiometric luminescent thermometer based on a Tb(iii) coordination polymer

Isomorphic oxamate derivatives triple mesocates: From the synthesis to antibacterial activities

Metallacrown of CeIIICuII5: Synthesis, Structural Characterization and Insights for Nanoparticles

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