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Structural distortion and magnetic behavior in cyanide-bridged (Fe2Ni2II)-Ni-III complexes

机译:氰化物桥联(Fe2Ni2II)-Ni-III配合物的结构畸变和磁行为

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摘要

The X-ray structure, spectroscopic, and magnetic properties of acyanide-bridged complex,([(Tp*)Fe-III(CN)(3)](2)[Ni-II(bipy)(2)](2)[OTf](2)}(.)2H(2)O (2) are described [Tp* = hydridotris(3,5-dimethylpyrazol-1-yl)borate; bipy = 2,2'-bipyridine; OTf = trifluromethanesulfonate]. Magnetic measurements indicate that 2 exhibits an S = 3 ground state and slow relaxation of the magnetization. Magnetostructural comparisons to the more symmetrical analog 1[(Tp*)Fe-III(CN)(3)](2)[Ni-II(DMF)(4)](2)-[OTf](2)}(.)2DMF (1) are also described. Surprisingly, the magnetic properties of 1 and 2 are similar despite the presence of a non-planar ((Fe2Ni2II)-Ni-III(mu-CN)(4)} core and severely distorted NiII coordination sphere in 2, suggesting that the Ni'l centers play a minor role in the slow magnetization relaxation behavior of the clusters. (c) Wiley-VCH Verlag GmbH & Co. KGaA.
机译:氰化物桥联络合物[[(Tp *)Fe-III(CN)(3)](2)[Ni-II(bipy)(2)](2)的X射线结构,光谱和磁性[OTf](2)}(。)2H(2)O(2)描述为[Tp * =氢化三(3,5-二甲基吡唑-1-基)硼酸酯; bipy = 2,2'-联吡啶; OTf =三氟甲磺酸酯磁性测量表明2呈现S = 3的基态,磁化缓慢,与更对称的类似物1 [(Tp *)Fe-III(CN)(3)](2)[Ni-还描述了II(DMF)(4)](2)-[OTf](2)}(。)2DMF(1)。令人惊讶的是,尽管存在非平面( (Fe2Ni2II)-Ni-III(mu-CN)(4)}核和NiII严重变形的NiII配位球,表明Ni'l中心在团簇的慢磁化弛豫行为中起次要作用。 Wiley-VCH Verlag GmbH&Co. KGaA。

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