Yamaguchi, Tomoka Costes, Jean-Pierre Kishima, Yukana Kojima, Masaaki Sunatsuki, Yukinari Bréfuel, Nicolas Tuchagues, Jean-Pierre Vendier, Laure Wernsdorfer, Wolfgang Face-Sharing Heterotrinuclear M<sup>II</sup>−Ln<sup>III</sup>−M<sup>II</sup> (M = Mn, Fe, Co, Zn; Ln = La, Gd, Tb, Dy) Complexes: Synthesis, Structures, and Magnetic Properties Trinuclear linear 3d−4f−3d complexes (3d = Mn<sup>II</sup>, Fe<sup>II</sup>, Co<sup>II</sup>, Zn<sup>II</sup> and 4f = La<sup>III</sup>, Gd<sup>III</sup>, Tb<sup>III</sup>, Dy<sup>III</sup>) were prepared by using a tripodal nonadentate Schiff base ligand, <i>N,N′,N′</i>′-tris(2-hydroxy-3-methoxybenzilidene)-2-(aminomethyl)-2-methyl-1,3-propanediamine. The structural determinations showed that in these complexes two distorted trigonal prismatic transition metal complexes of identical chirality are assembled through 4f cations. The Mn and Fe entities crystallize in the chiral space group <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> as pure enantiomers; the cobalt complexes exhibit a less straightforward behavior. All Mn, Fe, and Co complexes experience M<sup>II</sup>−Ln<sup>III</sup> ferromagnetic interactions. The Mn−Gd interaction is weak (0.08 cm<sup>−1</sup>) in comparison to the Fe−Gd (0.69 cm<sup>−1</sup>) and Co−Gd (0.52 cm<sup>−1</sup>) ones while the single ion zero field splitting (ZFS) term <i>D</i> is larger for the Fe complexes (5.7 cm<sup>−1</sup>) than for the cobalt ones. The cobalt complexes behave as single-molecules magnets (SMMs) with large magnetization hysteresis loops, as a consequence of the particularly slow magnetic relaxation characterizing these trinuclear molecules. Such large hysteresis loops, which are observed for the first time in Co-Ln complexes, confirm that quantum tunnelling of the magnetization does not operate in the Co−Gd−Co complex. MII;ZFS;hysteresis loops;Fe entities;tripodal nonadentate Schiff base ligand;cobalt complexes exhibit;4 f;chiral space group P 212121;4 f cations;prismatic transition metal complexes;magnetization hysteresis loops;term D;Mn;cm;quantum tunnelling;SMM;cobalt ones;field splitting;trinuclear molecules;cobalt complexes;Magnetic PropertiesTrinuclear;Co 2010-10-18
    https://acs.figshare.com/articles/journal_contribution/Face_Sharing_Heterotrinuclear_M_sup_II_sup_Ln_sup_III_sup_M_sup_II_sup_M_Mn_Fe_Co_Zn_Ln_La_Gd_Tb_Dy_Complexes_Synthesis_Structures_and_Magnetic_Properties/2720764
10.1021/ic100460w.s001