Polymorphic derivatives of NiII and CoII Mesocates with 3D networks and “brick and Mmar” structures: preparation, structural characterization, and cryomagnetic investigation of new single-molecule magnets

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dc.creatorMariano, Ludmila dos Santos
dc.creatorRosa, Iara Maria Landre
dc.creatorCampos, Nathália Rodrigues de
dc.creatorDoriguetto, Antonio Carlos
dc.creatorDias, Danielle Ferreira
dc.creatorPim, Walace Doti do
dc.creatorValdo, Ana Karoline Silva Mendanha
dc.creatorMartins, Felipe Terra
dc.creatorRibeiro, Marcos Antônio
dc.creatorPaula, Elgte Elmin Borges de
dc.date.accessioned2023-11-20T15:24:12Z
dc.date.available2023-11-20T15:24:12Z
dc.date.issued2020
dc.description.abstractIn this work we describe the preparation, spectroscopic, thermal and structural characterization, and cryomagnetic investigation of four new polymorphic derivatives of the [M2(H2mpba)3]2– mesocate of formulas {[K2(dmf)2(H2O)2][M2(H2mpba)3]·2H2O}n (M = Co (1), Ni (2)) and [M(tppz)2][M2(H2mpba)3]·9H2O (M = Co (3), Ni (4)) (H4mpba = 1,3-phenylenebis(oxamic) acid), tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine). Pairs 1/2 and 3/4 are isomorphous compounds exhibiting a triple-stranded dinuclear motif, [M2(H2mpba)3]2–. 1 and 2 exhibit a three-dimensional network with [M2(H2mpba)3]2– mesocates interlinked by potassium(I) ions. 3 and 4 present a brick and mortar network, where the “brick” is [M2(H2mpba)3]2– + [M(tppz)2]2+ and the “mortar” refers to water molecules, where the electroneutrality of the motif is achieved by the [M(tppz)2]2+ cationic complex. The dc magnetic data for 1–4 in the temperature range 1.9–300 K reveal the occurrence of magnetically isolated high-spin cobalt(II) of the mesocate units in 1 and 3 plus a thermally induced spin crossover behavior of the [Co(tppz)2]2+ unit in 3, whereas 2 and 4 exhibit Curie law behavior. Out-of-phase ac signals are observed for 1 and 3 at temperatures below 14 K under zero and nonzero applied dc fields, which are characteristic of the occurrence of slow magnetic relaxation in these systems, thus being new examples of single-molecule magnets (SMMs).
dc.identifier.citationMARIANO, Ludmila dos S. et al. Polymorphic derivatives of NiII and CoII mesocates with 3D networks and “brick and Mmar” structures: preparation, structural characterization, and cryomagnetic investigation of new single-molecule magnets. Crystal Growth & Design, Washington, v. 20, p. 2462-2476, 2020. DOI: 10.1021/acs.cgd.9b01638. Disponível em: https://pubs.acs.org/doi/10.1021/acs.cgd.9b01638. Acesso em: 14 nov. 2023.
dc.identifier.doi10.1021/acs.cgd.9b01638
dc.identifier.isbne- 1528-7505
dc.identifier.issn1528-7483
dc.identifier.urihttps://pubs.acs.org/doi/10.1021/acs.cgd.9b01638
dc.language.isoeng
dc.publisher.countryEstados unidos
dc.publisher.departmentInstituto de Química - IQ (RMG)
dc.rightsAcesso Restrito
dc.titlePolymorphic derivatives of NiII and CoII Mesocates with 3D networks and “brick and Mmar” structures: preparation, structural characterization, and cryomagnetic investigation of new single-molecule magnets
dc.typeArtigo

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