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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Crystal structures and magnetic properties of triple helical binuclear complexes with bis(bidentate) diazine ligands
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Crystal structures and magnetic properties of triple helical binuclear complexes with bis(bidentate) diazine ligands

机译:双(双齿)二嗪配体的三重螺旋双核配合物的晶体结构和磁性

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Three triple helical binuclear complexes [Ni-2(L-1)(3)]center dot(ClO4)(4)center dot(H2O)(3) (1) (L-1 = 1,4-bis(2-pyridyl)-1-amino-4-methyl-2,3-diaza-1,3-butadiene), [Ni(L-2)(3)]center dot(ClO4)(4)center dot(H2O)(3) (2) (L-2 = 2,5-bis(2-pyridyl)-3,4-diaza-2,4-hexadiene) and [Mn-2(L-1)(3)]center dot(ClO4)(4)center dot(H2O)(3) (3) have been studied, where the L-1 ligand possesses a rotationally flexible single N-N bond. In complexes 1-3, the three bis(bidentate) diazine ligands wrap around two metal cations with a spiral conformation, leading to a triple helicate with C-3 symmetry. Magnetic investigations revealed that antiferromagnetic interactions are operative between the two metal ions linked by the triple diazine bridges, with J = -2.97 and -5.40 cm(-1) for 1 and 2, respectively. Variable temperature magnetic data for 3 indicates a weak ferromagnetic interaction between the two manganese(II) centers with J = 1.24 cm(-1). The X-ray powder diffraction of 3 is also discussed. (c) 2006 Elsevier Ltd. All rights reserved.
机译:三个三重螺旋双核络合物[Ni-2(L-1)(3)]中心点(ClO4)(4)中心点(H2O)(3)(1)(L-1 = 1,4-bis(2-吡啶基)-1-氨基-4-甲基-2,3-二氮杂-1,3-丁二烯),[Ni(L-2)(3)]中心点(ClO4)(4)中心点(H2O)(3 )(2)(L-2 = 2,5-双(2-吡啶基)-3,4-重氮-2,4-己二烯)和[Mn-2(L-1)(3)]中心点(ClO4 )(4)中心点(H2O)(3)(3)已被研究,其中L-1配体具有旋转柔性单NN键。在配合物1-3中,三个双(二齿)二嗪配体环绕着两个具有螺旋构象的金属阳离子,从而形成具有C-3对称性的三螺旋。磁性研究表明,通过三重二嗪桥连接的两个金属离子之间存在反铁磁相互作用,J和-分别为1和2的J = -2.97和-5.40 cm(-1)。 3的可变温度磁数据表明两个锰(II)中心之间的铁磁相互作用较弱,J = 1.24 cm(-1)。还讨论了3的X射线粉末衍射。 (c)2006 Elsevier Ltd.保留所有权利。

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