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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >A mononuclear complex and a cubane cluster from the initial use of 2-(hydroxymethyl)pyridine in nickel(II) carboxylate chemistry
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A mononuclear complex and a cubane cluster from the initial use of 2-(hydroxymethyl)pyridine in nickel(II) carboxylate chemistry

机译:最初在羧酸镍(II)化学中使用2-(羟甲基)吡啶形成的单核络合物和古巴群

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摘要

The reactions of 2-(hydromethyl)pyridine, hmpH, with Ni(O2CMe)(2)center dot 4H(2)O in H2O, in the absence of counterions, have been investigated. The synthetic study has led to the two new complexes [Ni(O2CMe)(2)(hmpH)(2)] (1) and [Ni-4(O2CMe)(4)(hmp)(4)(H2O)(2)] (2). Complex 1 can also be transformed into 2 by reacting with an excess of NaCH in H2O. The structures of 1 and 2.2,25H(2)O center dot 0.5(1,4-dioxane) have been solved by single-crystal, X-ray crystallography. The octahedral Ni-II center in centrosymmetric 1 is coordinated by two 1.10 (Harris notation) MeCO2- groups and two N,O-chelating (1.11) hpmH ligands. The tetranuclear cluster molecule of 2.2.25H(2)O center dot 0.5(1,4-dioxane) possesses a distorted cubane {Ni-4([mu(3)-OR')(4)}(4+) core [R' = (2-pyridyl)CH2-] with the Ni-II ions and the oxygen atoms from the 3.31 hmp(-) ligands occupying alternate vertices of the cube. Two 2.11 MeCO2- groups cap two opposite faces of the cube, while two 1.10 MeCO2- ions and two aqua ligands complete the octahedral coordination sphere of the metal centers. Characteristic IR bands for the two complexes are discussed in terms of the nature of bonding and the structures of the two complexes. The variable-temperature magnetic properties of 2 have been modeled with two J values, and reveal anti ferromagnetic exchange interactions between the four Ni-II ions to give a diamagnetic ground state.
机译:在没有抗衡离子的情况下,研究了2-(氢甲基)吡啶hmpH与Ni(O2CMe)(2)中心点4H(2)O在H2O中的反应。综合研究导致了两个新的配合物[Ni(O2CMe)(2)(hmpH)(2)](1)和[Ni-4(O2CMe)(4)(hmp)(4)(H2O)(2) )](2)。配合物1也可以通过与过量的NaCH在H2O中反应而转变为2。 1和2.2,25H(2)O中心点0.5(1,4-二恶烷)的结构已通过单晶X射线晶体学解决。中心对称1的八面体Ni-II中心由两个1.10(哈里斯符号)MeCO2-和两个N,O-螯合(1.11)hpmH配体协调。 2.2.25H(2)O中心点0.5(1,4-二恶烷)的四核簇分子具有扭曲的古巴铝{Ni-4([mu(3)-OR')(4)}(4+)核心[ R'=(2-吡啶基)CH2-],其中Ni-II离子和来自3.31 hmp(-)配体的氧原子占据了立方体的其他顶点。两个2.11 MeCO2-基团覆盖了立方体的两个相对面,而两个1.10 MeCO2-离子和两个水族配体完善了金属中心的八面体配位球。根据键合的性质和两种络合物的结构,讨论了两种络合物的特征红外波段。 2的变温磁性能已通过两个J值建模,并揭示了四个Ni-II离子之间的反铁磁交换相互作用,从而产生了反磁性基态。

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