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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Synthesis, crystal structure and magnetic properties of (acetato-κ2O,O′)bis(5,5′-dimethyl-2,2′-bipyridine-κ2N,N′)nickel(II) perchlorate monohydrate
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Synthesis, crystal structure and magnetic properties of (acetato-κ2O,O′)bis(5,5′-dimethyl-2,2′-bipyridine-κ2N,N′)nickel(II) perchlorate monohydrate

机译：（乙酰基-κ2O，O'）双（5,5'-二甲基-2,2'-联吡啶-κ2N，N'）高氯酸镍（II）的合成，晶体结构和磁性

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摘要

The title hydrated ionic complex, [Ni(CH3COO)(C12H12N2)2]ClO4·H2O or [Ni(ac)(5,5′-dmbpy)2]ClO4·H2O (where 5,5′-dmbpy is 5,5′-dimethyl-2,2′-bipyridine and ac is acetate), (1), was isolated as violet crystals from the aqueous ethanolic nickel acetate–5,5′-dmbpy–KClO4 system. Within the complex cation, the NiII atom is hexacoordinated by two chelating 5,5′-dmbpy ligands and one chelating ac ligand. The mean Ni—N and Ni—O bond lengths are 2.0628?(17) and 2.1341?(15)??, respectively. The water solvent molecule is disordered over two partially occupied positions and links two complex cations and two perchlorate anions into hydrogen-bonded centrosymmetric dimers, which are further connected by π–π interactions. The magnetic properties of (1) at low temperatures are governed by the action of single-ion anisotropy, D, which arises from the reduced local symmetry of the cis-NiO2N4 chromophore. The fitting of the variable-temperature magnetic data (2–300?K) gives giso = 2.134 and D/hc = 3.13?cm?1.
机译：标题水合离子络合物[Ni（CH3COO）（C12H12N2）2] ClO4·H2O或[Ni（ac）（5,5'-dmbpy）2] ClO4·H2O（其中5,5'-dmbpy为5,5从乙醇醋酸镍–5,5'-dmbpy-KClO4体系中分离出紫色晶体，形成紫色结晶的'-二甲基-2,2'-联吡啶和ac为乙酸盐。在配位阳离子中，NiII原子被两个螯合的5,5'-dmbpy配体和一个螯合的ac配体六配位。 Ni-N和Ni-O的平均键长分别为2.0628Ω（17）和2.1341Ω（15）Ω。水溶剂分子在两个部分占据的位置无序，并将两个络合阳离子和两个高氯酸根阴离子连接成氢键结合的中心对称二聚体，它们通过π-π相互作用进一步连接。 （1）在低温下的磁性能受单离子各向异性D的作用支配，这是由于顺式NiO2N4生色团的局部对称性降低所致。可变温度磁数据（2-300？K）的拟合给出giso = 2.134和D / hc = 3.13？cm？1。

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