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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A carboxylate-bridged Ni-8(II) cluster with a distorted cubane topology: structure, magnetism and density functional studies
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A carboxylate-bridged Ni-8(II) cluster with a distorted cubane topology: structure, magnetism and density functional studies

机译:羧酸盐桥接的Ni-8(II)簇具有扭曲的古巴拓扑:结构,磁性和密度泛函研究

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摘要

Using a dicarboxylate ligand appended with (2-pyridyl)ethylamine unit, a new cluster [Ni-8(II)(L-4)(6)-(DMF)(2)(CH3OH)(2)(H2O)(6)][ClO4](4)center dot 2CH(3)OH center dot 2CH(3)CO(2)C(2)H(5) (1) [L-4(2-): 3-[N-{2-(pyridin-2-yl)ethyl}amino]bis(propionate)] has been synthesized, through 'coordination-driven self-assembly'. The crystal structure of 1 reveals a centrosymmetric octanuclear carboxylate-bridged nickel(II) tetracation, with a distorted cubane topology. The four crystallographically independent nickel(II) centres differ markedly in their coordination environment. Magnetic studies (2-300 K) reveal that in 1 the net magnetic-exchange is antiferromagnetic. Based on geometric parameters associated with two interacting nickel(II) centres, six magnetic-exchange coupling constants (J values) were considered for magnetic data analysis. Notably, 1 provides the first example of a Ni-8(II) cluster (i) bridged solely by carboxylates in three bridging modes (monatomic, syn-anti and anti-anti), (ii) exhibiting four ferromagnetic and two antiferromagnetic magnetic-interactions and (iii) demonstrating a good agreement between six J values (obtained from experimental data analysis) and those obtained from DFT calculations, at the B3LYP-level of theory.
机译:使用附加了(2-吡啶基)乙胺单元的二羧酸配体,形成新簇[Ni-8(II)(L-4)(6)-(DMF)(2)(CH3OH)(2)(H2O)(6 )] [ClO4](4)中心点2CH(3)OH中心点2CH(3)CO(2)C(2)H(5)(1)[L-4(2-):3- [N- {2-(吡啶-2-基)乙基}氨基]双(丙酸酯)]是通过“配位驱动的自组装”合成的。 1的晶体结构揭示了一个中心对称的八核羧酸盐桥连的镍(II)阳离子,具有扭曲的古巴拓扑。四个在晶体学上独立的镍(II)中心的配位环境显着不同。磁研究(2-300 K)显示,净磁交换在1中为反铁磁。基于与两个相互作用的镍(II)中心相关的几何参数,考虑了六个磁交换耦合常数(J值)用于磁数据分析。值得注意的是,图1提供了Ni-8(II)簇的第一个例子(i)仅通过羧酸盐以三种桥接模式(单原子,顺-抗和抗-抗)桥接,(ii)表现出四个铁磁和两个反铁磁-相互作用;(iii)在理论上的B3LYP级别上,证明了六个J值(从实验数据分析中获得)与从DFT计算获得的J值之间具有良好的一致性。

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