Two-step magnetic transition in hybrid organic–inorganic materials of the (m-xylylenediamine)MeSO4 (Me – Mn, Fe, Co, Ni) type

New hybrid organic–inorganic materials of the (MXDA)MeSO4 type, where Me – MnII, FeII, CoII or NiII and MXDA – m-xylylenediamine, were successfully synthesised using the solvothermal technique. Crystal structure studies proved that all of the obtained compounds crystallised in the orthorhombic cryst...

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Bibliographic Details
Published in:New journal of chemistry 2018, Vol.42 (22), p.18225-18235
Main Authors: Luberda-Durnaś, K, Konieczny, P, Pełka, R, Oszajca, M, A Gonzalez Guillen, Korecki, J, Ciesielska, Z, Łasocha, W
Format: Article
Language:English
Subjects:
Antiferromagnetism
Coupling (molecular)
Crystal structure
Crystallites
Dipole interactions
Dipoles
Ferromagnetism
Inorganic materials
Iron sulfates
Magnetic moments
Magnetic transitions
Manganese
Metal sheets
Morphology
Mossbauer spectroscopy
Nickel
Nitrogen atoms
Planes
Stability analysis
Temperature dependence
Thermal stability
X ray spectra
X-ray diffraction
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Summary:New hybrid organic–inorganic materials of the (MXDA)MeSO4 type, where Me – MnII, FeII, CoII or NiII and MXDA – m-xylylenediamine, were successfully synthesised using the solvothermal technique. Crystal structure studies proved that all of the obtained compounds crystallised in the orthorhombic crystal system and the P21ma space group (no. 26). All structures contain layers parallel to the (010) plane, built of metal atoms linked by SO42− anions. These layers are joined via m-xylylenediamine molecules acting as linkers which complete the distorted octahedral coordination sphere of the metal centres; MeO4N2 – four oxygen and two nitrogen atoms. Magnetic studies for compounds where Me = MnII, CoII, and NiII reveal transitions to magnetic long-range ordered phases with temperatures of 14.4, 33.0, and 25.8 K, respectively, due to a domination of ferromagnetic interaction within the planes; m-xylylenediamine ligands efficiently separate adjacent metal ion sheets, rendering the superexchange coupling between the planes negligible. Nevertheless, at sufficiently low temperatures, dipole–dipole interaction leads to antiferromagnetic ordering of the magnetic moments belonging to adjacent MeSO4 layers. In addition to structure determination and magnetic studies, all materials were analysed using thermogravimetric measurements and temperature-dependent X-ray diffraction to test their thermal stability. The morphology of the crystallites was analysed using a scanning electron microscope. Sample (MXDA)FeSO4 was additionally studied using Mössbauer spectroscopy.
ISSN:1144-0546
1369-9261
DOI:10.1039/c8nj04036b