Dicopper(II) metallacyclophanes with N,N′-2,6-pyridinebis(oxamate): solution study, synthesis, crystal structures, and magnetic properties

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dc.creatorFernandes, Tamires Soares
dc.creatorVilela, Ramon Silva
dc.creatorValdo, Ana Karoline Silva Mendanha
dc.creatorMartins, Felipe Terra
dc.creatorGarcía-España Monsonís, Enrique Víctor
dc.creatorInclán Nafría, Mario Alfonso
dc.creatorCano Boquera, Joan
dc.creatorLloret Pastor, Francesc
dc.creatorJulve Olcina, Miguel
dc.creatorStumpf, Humberto Osório
dc.creatorGomes, Danielle Cangussu de Castro
dc.date.accessioned2023-10-20T20:06:29Z
dc.date.available2023-10-20T20:06:29Z
dc.date.issued2016
dc.description.abstractThe complexing ability of copper(II) in solution by the ligand N,N′-2,6-pyridinebis(oxamic acid) (H4mpyba, H4L) was determined through potentiometric and UV–vis spectroscopy at 25 °C and 0.15 M NaCl. The logarithms of the equilibrium constants for its copper(II) complexes according to the eqs 2H2L + 2Cu ⇆ [Cu2(H2L)2], 2H2L + 2Cu ⇆ [Cu2(H2L) (HL)] + H, 2H2L + 2Cu ⇆ [Cu2(HL)2] + 2H, 2H2L + 2Cu ⇆ [Cu2(HL)(L)] + 3H, and 2H2L + 2Cu ⇆ [Cu2L2] + 4H were 12.02(7), 8.04(5), 1.26(6), −7.51(6), and −16.36(6), respectively. The knowledge of the solution behavior has supported the synthesis of three new compounds bearing the common building block Cu2L24–. Their formulas are (Me4N)4[Cu2(mpyba)2(H2O)2]·H2O (1), (Me4N)4[K2Na2Cu4(mpyba)4(H2O)6.8]·1.6H2O (2), and [Na6Cu2(mpyba)2Cl2(H2O)8]·7H2O (3) (Me4N+ = tetramethylammonium cation). The [Cu2(mpyba)2(H2O)2]4– tetraanionic unit, which is present in 1, has a [3,3] metallacyclophane-type motif connected by two N–Cu–N bonds. In 2, a heterotrimetallic decanuclear nanocage is formed through front-to-front assembly of two [Cu2(mpyba)2]4– units, which also coordinate to potassium(I) and sodium(I) cations by means of carboxylate oxygens from oxamate. The structure of 3 consists of heterobimetallic layers of formula [Na6Cu2(mpyba)2Cl2(H2O)8] and crystallization water molecules, which are interlinked by hydrogen bonds leading to a supramolecular three-dimensional network. The investigation of the magnetic properties of 1–3 in the temperature range 1.9–300 K shows the occurrence of ferromagnetic interactions between the dicopper(II) metallacyclophane unit [J = +6.85 (1), +7.40 (2), and +7.90 cm–1 (3); H = −JSCu1·SCu2, where SCu1 = SCu2 = 1/2]. Theoretical calculations on 1–3 were carried to substantiate the nature and magnitude of the involved magnetic interactions and to support the occurrence of a spin polarization mechanism accounting for them.
dc.identifier.citationFERNANDES, Tamires S. et al. Dicopper(II) metallacyclophanes with N,N′-2,6-pyridinebis(oxamate): solution study, synthesis, crystal structures, and magnetic properties. Inorganic Chemistry, Washington, v. 55, n. 5, p. 2390-2401, 2016. DOI: 10.1021/acs.inorgchem.5b02786. Disponível em: https://pubs.acs.org/doi/10.1021/acs.inorgchem.5b02786. Acesso em: 29 set. 2023.
dc.identifier.doi10.1021/acs.inorgchem.5b02786
dc.identifier.issn0020-1669
dc.identifier.issne- 1520-510X
dc.identifier.urihttps://pubs.acs.org/doi/10.1021/acs.inorgchem.5b02786
dc.language.isoeng
dc.publisher.countryEstados unidos
dc.publisher.departmentInstituto de Química - IQ (RMG)
dc.rightsAcesso Restrito
dc.titleDicopper(II) metallacyclophanes with N,N′-2,6-pyridinebis(oxamate): solution study, synthesis, crystal structures, and magnetic properties
dc.typeArtigo

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