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Cristallochimie de composés hybrides de type hydroxydicarboxylate de métaux de la première série de transition et magnétisme

Abstract : Hybrid compounds afford the advantage to associate the properties of the organic and mineral part in order to present multifunctional behaviours. The compounds synthesized by the hydrothermal way are the first transition metal series (oxidation degree: 2+) hydroxydicarboxylates to study their magnetic properties. In the M(II)2(OH)2(C8H4O4) series where M = Mn, Fe, Co, Cu, the compounds follow the same crystallographic model determined from the X ray powder diffraction data. The super exchange ways are modified with the Cu compound because of the Yahn-Teller effect, witch modified the magnetic behaviour (antiferro à ferro).In the Cu-Co solid solution, the TN or the TC (for the base Co or Cu respectively) vary according to the substitution rate. This is in order to reach a limit due to the crystalline field. The structures of [Ni3(OH)2(C8H4O4)2(H2O)4].2H2O, Zn2(OH)2(C8H4O4) and Zn3(OH)4(C8H4O4) compounds were been solved ab initio with the X Ray powder diffraction for both the firsts compounds and with single crystal data for the third one. The last studied compound family is M5(OH)6(CnH2n-4O4)2 (= M-Cn) where M = Co, Ni and n = 6, 8. The Co-C8, Ni-C6 and Ni-C8 compounds crystallize in the same structure. The magnetic property data show the evolution in relation to the magnetic cation type (ferro for cobalt and antiferro for copper) or to the carbon chain length (TN evolution). The structural model for Co-C6, suggested in the literature, is discussed thanks to new measures recorded with a new sample obtain by the hydrothermal method.
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Submitted on : Friday, March 30, 2018 - 9:44:12 AM
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Anne Carton. Cristallochimie de composés hybrides de type hydroxydicarboxylate de métaux de la première série de transition et magnétisme. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10143⟩. ⟨tel-01754303⟩



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