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
dc.creator | Mariano, Ludmila dos Santos | |
dc.creator | Rosa, Iara Maria Landre | |
dc.creator | Campos, Nathália Rodrigues de | |
dc.creator | Doriguetto, Antonio Carlos | |
dc.creator | Dias, Danielle Ferreira | |
dc.creator | Pim, Walace Doti do | |
dc.creator | Valdo, Ana Karoline Silva Mendanha | |
dc.creator | Martins, Felipe Terra | |
dc.creator | Ribeiro, Marcos Antônio | |
dc.creator | Paula, Elgte Elmin Borges de | |
dc.date.accessioned | 2023-11-20T15:24:12Z | |
dc.date.available | 2023-11-20T15:24:12Z | |
dc.date.issued | 2020 | |
dc.description.abstract | In 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.citation | MARIANO, 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.doi | 10.1021/acs.cgd.9b01638 | |
dc.identifier.isbn | e- 1528-7505 | |
dc.identifier.issn | 1528-7483 | |
dc.identifier.uri | https://pubs.acs.org/doi/10.1021/acs.cgd.9b01638 | |
dc.language.iso | eng | |
dc.publisher.country | Estados unidos | |
dc.publisher.department | Instituto de Química - IQ (RMG) | |
dc.rights | Acesso Restrito | |
dc.title | 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 | |
dc.type | Artigo |
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