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Layered structure of a supramolecular hybrid sulfate salts: thermal stability and magnetic behavior

Abstract : The incorporation of the aromatic diamine 2-methylimidazole as template in the synthesis of hybrid sulfate salts with transition metal was effected by the slow evaporation method. The resulting structure presents a lamellar character with a supramolecular network, which is uncommon in the family of sulfates and their derivates. The three synthesized compound with the general formula (C4H7N2)2[MII(H2O)6](SO4)2·2H2O (MII = Zn, Co and Mn) crystallize in the monoclinic symmetry, space group P21/c. According to the design shape of the protonated amine and its bonding relations between the supramolecular inorganic layers, building from hydrogen bond only, the interlamellar distance reached 11.6 Å. The π-stacking between aromatic moieties of amines have a relevant role in stabilizing the lamellar structure. The thermal study with in situ powder X-ray diffraction and thermogravimetry of the synthesized compounds showed that the dehydration stage of precursors lead to the formation of an anhydrous crystalline phase with a good thermal stability. Beyond this and under the decomposition stage, Co and Zn compound become amorphous whereas the Mn-based compound showed successive crystalline phases. The magnetic measurements performed for the cobalt based compound indicate a low interaction exchange within the material in agreement with a typical paramagnetic behavior
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Submitted on : Wednesday, November 18, 2015 - 9:57:00 AM
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Omar Kammoun, Houcine Naïli, Walid Rekik, Thierry Bataille. Layered structure of a supramolecular hybrid sulfate salts: thermal stability and magnetic behavior. Inorganica Chimica Acta, Elsevier, 2015, 434, pp.209-214. ⟨10.1016/j.ica.2015.05.031⟩. ⟨hal-01162337⟩

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