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Crystal structure and characterization of manganese(II) carboxylates: 3D metal-organic frameworks

机译:羧酸锰(II)的晶体结构和表征:3D金属-有机骨架

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Three mononuclear manganese (II) complexes with quinoline-2-carboxylate ion (quin-2-c), [Mn(quin-2-C)(2)(H2O)(2)](2)center dot Hquin-2-c center dot 2H(2)O (1), Mn(quin-2-C)(2)(EtOH)(2) (2), and HbimH[Mn(quin-2-C)(2)Cl] (3) (HbimH(+) = benzimidazolium ion), have been obtained by self-assembly and structurally characterized by X-ray diffraction. In all three complexes the quin-2-c ions are bound to manganese in the chelate mode through a ring nitrogen and a monodentate carboxylate group. In complexes 1 and 2 the manganese ions are coordinated in the distorted octahedron with an N2O4 donor set. In the complex anion Mn(quin-2-C)(2)Cl-, present in the crystal of 3, the manganese ion is five-coordinated by two quin-2-c ligands and the chlorine ion. The solid-state EPR spectra of 1 and 2 are characteristic of the Mn(II) ion in a distorted-octahedral geometry, whereas the spectrum of 3 is more complicated due to the zero-field splitting effect operating at lower symmetry. The EPR spectra of all complexes in frozen ROH are very similar and are characteristic of an octahedral environment around manganese. The systems of strong intermolecular hydrogen bonds form 1D structures in all complexes, which are further engaged in weak C-H center dot center dot center dot O, pi center dot center dot center dot pi and C-H center dot center dot center dot pi interchain interactions, creating the 3D networks. The IR spectra reflect the differences in the hydrogen bond systems in 1-3.
机译:三种单核锰(II)与喹啉-2-羧酸根离子(quin-2-c),[Mn(quin-2-C)(2)(H2O)(2)](2)中心点Hquin-2-的配合物c中心点2H(2)O(1),Mn(quin-2-C)(2)(EtOH)(2)(2)和HbimH [Mn(quin-2-C)(2)Cl]( 3)(HbimH(+)=苯并咪唑鎓离子),是通过自组装获得的,并通过X射线衍射对其结构进行了表征。在所有三种配合物中,quin-2-c离子通过环氮和单齿羧酸酯基团以螯合模式与锰结合。在配合物1和2中,锰离子在扭曲的八面体中与N2O4供体对配位。在3晶体中存在的复合阴离子Mn(quin-2-C)(2)Cl-中,锰离子由两个quin-2-c配体和氯离子进行五配位。 1和2的固态EPR光谱是扭曲八面体几何形状中Mn(II)离子的特征,而3的光谱则由于零场分裂效应以较低的对称性工作而更加复杂。冷冻ROH中所有复合物的EPR光谱非常相似,并且是锰周围八面体环境的特征。强分子间氢键的体系在所有络合物中形成一维结构,并进一步参与弱CH中心点中心点中心点O,pi中心点中心点中心点pi和CH中心点中心点中心点pi的链间相互作用,从而形成3D网络。红外光谱反映了1-3中氢键体系的差异。

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