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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Magneto-structural study on a tetracopper(II) Schiff base complex stabilizing a decanuclear water aggregate
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Magneto-structural study on a tetracopper(II) Schiff base complex stabilizing a decanuclear water aggregate

机译:四铜(II)Schiff碱配合物稳定去核水团聚体的磁结构研究

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A new tetranuclear copper(II) complex [Cu4L2(3-ppz)(2)] (1) has been prepared from the reaction of [Cu2LBr] and 3-phenylpyrazole (3-ppz), where H3L is a pentadentate Schiff base N,N'-(2-hydroxypropane-1,3-diyl)bis(salicylaldimine). The complex as 1 center dot 6H(2)O has been structurally characterized by X-ray crystallography. The structure shows the presence of a tetranuclear copper(II) complex with a core showing Cu center dot center dot center dot Cu distances in the range of 3.261(1)-3.492(1) angstrom. The tetrameric complex is formed from the self-assembly of two dimeric {Cu2L}(+) units in the presence of two anionic 3-ppz ligands as linkers. The alkoxo oxygen atoms bind three copper(II) centers giving two equatorial and one axially elongated Cu-O bond. The variable temperature magnetic susceptibility data in the range 300-17 K show antiferromagnetic spin-spin coupling giving magnetic moments of 3.3 mu(B) at 300 K and 0.56 mu(B) at 17 K for the Cu-4 unit, theoretical fitting to the magnetic data gives J values of -86.3, -47.32 and 11.13 cm(-1) with a diamagnetic ground state. The crystal structure shows the presence of two complexes and 12 water molecules in the unit cell belonging to the triclinic space group P (1) over bar. Among them, 10 water molecules form an aggregate in which six water molecules are in a chair conformation of the cyclohexane-type with two water dimers hydrogen bonded to the cyclic structure. The discrete decameric water assembly is anchored onto the metalloorganic host involving four phenoxo oxygen atoms of two Cu-4 Units and four water molecules of the cyclic chair hexameric unit through hydrogen bonding interactions. (c) 2006 Elsevier Ltd. All rights reserved.
机译:由[Cu2LBr]与3-苯基吡唑(3-ppz)的反应制备了一种新的四核铜(II)配合物[Cu4L2(3-ppz)(2)](1),其中H3L是五齿席夫碱N ,N′-(2-羟基丙烷-1,3-二基)双(水杨基醛亚胺)。作为复合物的1个中心点6H(2)O已通过X射线晶体学进行了结构表征。该结构显示存在四核铜(II)配合物,其核的Cu中心点中心点中心点的Cu距离在3.261(1)-3.492(1)埃之间。由两个二聚{Cu2L}(+)单元在两个阴离子3-ppz配体作为连接基的存在下自组装形成四聚体复合物。烷氧基氧原子结合三个铜(II)中心,形成两个赤道和一个轴向延伸的Cu-O键。对于Cu-4单元,在300-17 K范围内的可变温度磁化率数据显示反铁磁自旋自旋耦合,在300 K时的磁矩为3.3μ(B),在17 K时的磁矩为0.56μ(B),理论上适合磁数据给出的J值为-86.3,-47.32和11.13 cm(-1),且具有反磁性基态。晶体结构显示在棒上属于三斜晶空间群P(1)的晶胞中存在两个络合物和12个水分子。其中,有10个水分子形成聚集体,其中6个水分子为环己烷型的椅子构型,且两个水二聚体氢键合至环状结构。分散的十聚水组装体通过氢键相互作用固定在金属有机主体上,该主体包含两个Cu-4单元的四个苯氧基氧原子和环状椅子六聚单元的四个水分子。 (c)2006 Elsevier Ltd.保留所有权利。

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