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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Tetranuclear homo- and heterometallic manganese(III) and nickel(II) complexes: Synthesis, structure, and magnetic studies
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Tetranuclear homo- and heterometallic manganese(III) and nickel(II) complexes: Synthesis, structure, and magnetic studies

机译:四核均金属和杂金属锰(III)和镍(II)配合物:合成,结构和磁性研究

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摘要

Three new polynuclear cluster complexes were synthesized and characterized using single-crystal X-ray measurements, infrared spectroscopy, and elemental analyses. A Schiff-base, 2-{[(1-hydroxybutan-2-yl)imino]methyl}phenol (himpH _2), synthesized in situ from the reaction of salicylaldehyde and (±)-2-aminobutanol, was used as ligand. Reactions of the ligand with different Mn ~(II) and Ni ~(II) salts led to two homometallic complexes and a heterometallic complex with [Mn ~(III) _4] (1), [Ni ~(II) _4] (2), and [Mn ~(III) _2Ni ~(II) _2] (3) cores exhibiting square, cubane-type, or butterfly arrangement, respectively. Analysis of the temperature dependence of the magnetic susceptibility of compounds 1-3, using appropriate spin Hamiltonians, indicated that the [Mn ~(III) _4] and [Ni ~(II) _4] compounds show dominant ferromagnetic coupling of the spin carriers, whereas the [Mn _2Ni _2] compound has antiferromagnetic Mn ~(III)-Ni ~(II) and ferromagnetic Ni ~(II)-Ni ~(II) interactions, with a spin ground state S _t = 2. Analyses of the magnetization data in 0-5 T fields at 2 K indicate the presence of positive zero-field splitting (ZFS) values, which is consistent with the absence of slow magnetic relaxation.
机译:合成了三种新的多核簇复合物,并使用单晶X射线测量,红外光谱和元素分析对其进行了表征。由水杨醛和(±)-2-氨基丁醇的反应原位合成的席夫碱2-{[((1-羟基丁-2-基)亚氨基]甲基}苯酚(himpH _2)用作配体。配体与不同的Mn〜(II)和Ni〜(II)盐的反应导致生成两个同金属配合物和一个具有[Mn〜(III)_4](1),[Ni〜(II)_4]的杂金属配合物(2 )和[Mn〜(III)_2Ni〜(II)_2](3)芯分别显示方形,古巴式或蝶形排列。使用适当的自旋哈密顿量分析化合物1-3的磁化率与温度的关系,表明[Mn〜(III)_4]和[Ni〜(II)_4]化合物显示出自旋载体的主要铁磁耦合,而[Mn _2Ni _2]化合物具有反铁磁性Mn〜(III)-Ni〜(II)和铁磁性Ni〜(II)-Ni〜(II)相互作用,自旋基态S _t =2。磁化分析2 K的0-5 T场中的数据表明存在正零场分裂(ZFS)值,这与不存在慢磁弛豫一致。

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