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 2 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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Study of the Counter Cation Effects on the Supramolecular Structure and Electronic Properties of a Dianionic Oxamate-Based {NiII2} Helicate

et al. 2023

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Herein, we describe the synthesis, crystal structure, and electronic properties of {[K2(dmso)(H2O)5][Ni2(H2mpba)3]·dmso·2H2O}n (1) and [Ni(H2O)6][Ni2(H2mpba)3]·3CH3OH·4H2O (2) [dmso = dimethyl sulfoxide; CH3OH = methanol; and H4mpba = 1,3-phenylenebis(oxamic acid)] bearing the [Ni2(H2mpba)3]2− helicate, hereafter referred to as {NiII2}. SHAPE software calculations indicate that the coordination geometry of all the NiII atoms in 1 and 2 is a distorted octahedron (Oh) whereas the coordination environments for K1 and K2 atoms in 1 are Snub disphenoid J84 (D2d) and distorted octahedron (Oh), respectively. The {NiII2} helicate in 1 is connected by K+ counter cations yielding a 2D coordination network with sql topology. In contrast to 1, the electroneutrality of the triple-stranded [Ni2(H2mpba)3] 2− dinuclear motif in 2 is achieved by a [Ni(H2O)6]2+ complex cation, where the three neighboring {NiII2} units interact in a supramolecular fashion through four R22(10) homosynthons yielding a 2D array. Voltammetric measurements reveal that both compounds are redox active (with the NiII/NiI pair being mediated by OH– ions) but with differences in formal potentials that reflect changes in the energy levels of molecular orbitals. The NiII ions from the helicate and the counter-ion (complex cation) in 2 can be reversibly reduced, resulting in the highest faradaic current intensities. The redox reactions in 1 also occur in an alkaline medium but at higher formal potentials. The connection of the helicate with the K+ counter cation has an impact on the energy levels of the molecular orbitals; this experimental behavior was further supported by X-ray absorption near-edge spectroscopy (XANES) experiments and computational calculations.

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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 2 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

Study of the Counter Cation Effects on the Supramolecular Structure and Electronic Properties of a Dianionic Oxamate-Based {NiII2} Helicate

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