Structural and Magnetic Properties of a Pyridyl(vinyl)benzoate-Based Metal–Organic Framework with Iron(II) as Spin Carrier

The synthesis and structural, magnetic, and hyperfine properties of a new metal–organic framework are presented. Its chemical formula is [Fe6(pvb)4(HCOO)6(OH)2]n·2n­(dmf)·2n­(H2O) (1), where pvb – = bis­{4-[2-(4-pyridyl)­vinyl]} benzoate. Compound 1 was obtained under hydro­(solvo)­thermal condition...

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Veröffentlicht in:Crystal growth & design 2024-05, Vol.24 (9), p.3595-3605
Hauptverfasser: Dezotti, Yuri, Vaz, Raphael Capruni Andrade, Ribeiro, Marcos Antônio, Passamani, Edson Caetano, de Almeida, Adriele Aparecida, Knobel, Marcelo, Ardisson, José Domingos, Barros, Wdeson Pereira
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Sprache:eng
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Zusammenfassung:The synthesis and structural, magnetic, and hyperfine properties of a new metal–organic framework are presented. Its chemical formula is [Fe6(pvb)4(HCOO)6(OH)2]n·2n­(dmf)·2n­(H2O) (1), where pvb – = bis­{4-[2-(4-pyridyl)­vinyl]} benzoate. Compound 1 was obtained under hydro­(solvo)­thermal conditions, presenting a hexanuclear iron­(II) motif, which extends through HCOO– and pvb – bridges, resulting in a 2D framework linked covalently to adjacent analogous layers by the pvb – ligands to form a 3D coordination polymer. 300 and 80 K 57Fe Mössbauer data suggested two paramagnetic iron­(II) species in the extended structure of compound 1, presenting a distorted octahedral high-spin state. Alternating current magnetization data recorded in zero and in-field showed two well-defined ordering temperatures at ca. 13 and 2.5 K for the two iron­(II) species in less and highly distorted octahedral symmetry, respectively. The system undergoes magnetic transition from a paramagnetic state at high temperatures to a magnetically ordered state at 13 K. At 2.5 K, the ordered spins present a canted-like structure. These magnetic states are field dependent, showing a metamagnetic phase transition for fields higher than 5 kOe. A remnant magnetization of 1.91 Nβ and a coercive field, H C, of 10 kOe are obtained at 2 K, indicating a hard magnetic state often found when AF and FM exchange interactions are present.
ISSN:1528-7483
1528-7505
DOI:10.1021/acs.cgd.3c01246