Binuclear CuLn complexes (LnIII = Gd, Tb, Dy) of alcohol-functionalized bicompartmental Schiff-base ligand. Hydrogen bonding and magnetic behaviors
Binuclear CuLn complexes (LnIII = Gd, Tb, Dy) of alcohol-functionalized bicompartmental Schiff-base ligand. Hydrogen bonding and magnetic behaviors
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DOI：
10.1016/j.ica.2015.09.032
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发表时间：
2016-01-01
影响因子：
2.8
通讯作者：
Sutter, Jean-Pascal
中科院分区：
文献类型：
--
作者：
Fellah, Fatima Zohra Chiboub;Boulefred, Soumia;Sutter, Jean-Pascal
本文报道了一系列四种双核铜镧配合物（Ln = Gd-III，Tb-III，Dy-III）的制备、晶体结构和磁性。这些是基于由1，3-二氨基丙-2-醇与邻香草醛缩合形成的双室席夫碱配体。已知这种席夫碱通常在金属配位中涉及其去质子化的醇基团，但这里不是这种情况。相反，OH单元参与氢键相互作用。当醇基位于由二氨基部分和Cu原子形成的六元环的轴向位置时，形成分子内和分子间氢键。在赤道位置，该基团仅参与分子间键合。相应的Cu-Tb衍生物表现为单分子磁体，Δ k（B）= 24.6 K，τ（0）= 2.1 × 10（-8）s（HDC = 1.5 kOe）。(C)2015 Elsevier B. V.版权所有。
Preparation, crystal structures and magnetic properties of a series of four binuclear Cu-Ln complexes are reported (Ln = Gd-III, Tb-III, and Dy-III). These are based on a bicompartmental Schiff-base ligand formed by condensation of 1,3-diaminopropan-2-ol with ortho-vanillin. This Schiff-base is known to usually involve its deprotonated alcohol group in metal coordination, which is not the case here. Instead the OH unit is engaged in H-bonding interactions. Intra-and inter-molecular H-bonds are formed when the alcohol group is located in axial position of the six-member ring formed by the diamino moiety and the Cu atom. In equatorial position, this group is only involved in intermolecular bonding. The corresponding Cu-Tb derivative is shown to behave as a Single Molecule Magnet with Delta k(B) = 24.6 K and tau(0) = 2.1 x 10(-8) s (HDC = 1.5 kOe). (C) 2015 Elsevier B.V. All rights reserved.