Lanthanide Complexes with Multidentate Oxime Ligands as Single‐Molecule Magnets and Atmospheric Carbon Dioxide Fixation Systems |
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| Authors: | Dr. Małgorzata Hołyńska Dr. Rodolphe Clérac Mathieu Rouzières |
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| Affiliation: | 1. Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften Universit?t Marburg, Hans‐Meerwein‐Strasse, 35032 Marburg (Germany);2. CNRS, CRPP, UPR 8641, 33600 Pessac (France);3. Univ. Bordeaux, CRPP, UPR 8641, 33600 Pessac (France) |
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| Abstract: | The synthesis, structure, and magnetic properties of five lanthanide complexes with multidentate oxime ligands are described. Complexes 1 and 2 ( 1 : [La2(pop)2(acac)4(CH3OH)], 2 : [Dy2(pop)(acac)5]) are synthesized from the 2‐hydroxyimino‐N‐[1‐(2‐pyridyl)ethylidene]propanohydrazone (Hpop) ligand, while 3 , 4 , and 5 ( 3 : [Dy2(naphthsaoH)2(acac)4H(OH)]?0.85 CH3CN?1.58 H2O; 4 : [Tb2(naphthsaoH)2(acac)4H(OH)]?0.52 CH3CN?1.71 H2O; 5 : [La6(CO3)2(naphthsao)5 (naphthsaoH)0.5(acac)8(CO3)0.5(CH3OH)2.76H5.5(H2O)1.24]?2.39 CH3CN?0.12 H2O) contain 1‐(1‐hydroxynaphthalen‐2‐yl)‐ethanone oxime (naphthsaoH2). In 1 – 4 , dinuclear [Ln2] complexes crystallize, whereas hexanuclear LaIII complex 5 is formed after fixation of atmospheric carbon dioxide. DyIII‐based complexes 2 and 3 display single‐molecule‐magnet properties with energy barriers of 27 and 98 K, respectively. The presence of a broad and unsymmetrical relaxation mode observed in the ac susceptibility data for 3 suggest two different dynamics of the magnetization which might be a consequence of independent relaxation processes of the two different Dy3+ ions. |
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| Keywords: | carbon dioxide fixation crystal structures lanthanides magnetic properties single‐molecule magnets |
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