Artículo
Tuning the magnetic properties of transition metal MOFs by metal–oxygen condensation control: the relation between synthesis temperature, SBU nuclearity and carboxylate geometry
Bernini, Maria Celeste
; Platero Prats, Ana E.; Snejko, Natalia; Gutierrez Puebla, Enrique; Labrador, Ana; Saez Puche, Regino; Romero de Paz, Julio; Monge, M. Angeles
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
05/2012
Editorial:
Royal Society Of Chemistry
Revista:
Crystengcomm
ISSN:
1466-8033
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Five novel metal organic frameworks, belonging to three structural types, have been obtained hydrothermally. Three of them, with formula [M3(hfipbb)2(OH)2(H2O)] (M = Mn, Co, Ni; hfipbb = 4,4′-(hexafluoroisopropylidene)bis(benzoate) dianion) belong to the first structural type. The crystal structure of the Mn-based compound was obtained from single crystal synchrotron X-ray diffraction data, while the isostructural compounds of Co and Ni were studied by means of Rietveld analysis using powder X-ray diffraction data. The magnetic behavior of the compounds with M = Co and Ni is characterized by the onset of long-range ferromagnetic order at very low temperature with Curie temperatures near 8 and 2.5 K, respectively. Such spontaneous magnetization seems to be preceded by low-dimensional magnetic interactions, due to the nature of the secondary building units (SBUs) of the structure, which are triple chains built by M3O14 units. Structural and topological analyses of [Mn2(hfipbb)2(H2hfipbb)] and [Co2(hfipbb)2(H2hfipbb)] (2 and 3 structural types, respectively; H2hfipbb = 4,4′-(hexafluoroisopropylidene)bis(benzoic acid)) demonstrate that the packing of the rod-shaped SBUs in 2 prevents the framework interpenetration giving rise to a bnn net whereas 3 is a 2-fold interpenetrated pcu net with isolated paddle-wheel clusters as SBUs pcu. Concerning the magnetic behavior of 2 and 3, antiferromagnetic interactions observed at very low temperature (magnetic susceptibility maximum at 2.8 and 18 K, respectively) are confined to the secondary building units.
Palabras clave:
Mofs
,
Magnetism
,
Hexafluoroisopropylidenebis(Benzoic) Acid
,
Topology
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Articulos(INFAP)
Articulos de INST. DE FISICA APLICADA "DR. JORGE ANDRES ZGRABLICH"
Articulos de INST. DE FISICA APLICADA "DR. JORGE ANDRES ZGRABLICH"
Citación
Bernini, Maria Celeste; Platero Prats, Ana E.; Snejko, Natalia; Gutierrez Puebla, Enrique; Labrador, Ana; et al.; Tuning the magnetic properties of transition metal MOFs by metal–oxygen condensation control: the relation between synthesis temperature, SBU nuclearity and carboxylate geometry; Royal Society Of Chemistry; Crystengcomm; 14; 17; 5-2012; 5493-5504
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