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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Mononuclear and three-dimensional metal complexes based on a multidentate hydrazone ligand
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Mononuclear and three-dimensional metal complexes based on a multidentate hydrazone ligand

机译：基于多齿配体的单核和三维金属络合物

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摘要

A potentially pentadentate hydrazone ligand, N'-[1-(pyrazin-2-yl)ethylidene]nicotinohydrazide (HL), was prepared from the condensation reaction of nicotinohydrazide and acetylpyrazine. Reactions of HL with MnCl2, Mn(CH3COO)2 and Cd(CH3COO)2 afforded three metal complexes, namely dichlorido{N'-[1-(pyrazin-2-yl-κN1)ethylidene]nicotinohydrazide-κ2 N',O}manganese(II), [MnCl2(C12H11N5O)], (I), bis{N'-[1-(pyrazin-2-yl-κN1)ethylidene]nicotinohydrazidato-κ2 N',O]manganese(II), [Mn(C12H10N5O)2], (II), and poly[[(acetato-κ2 O,O'){μ3-N'-[1-(pyrazin-2-yl-κ2 N1:N4)ethylidene]nicotinohydrazidato-κ3 N',O:N1}cadmium(II)] chloroform disolvate], {[Cd(C12H10N5O)(CH3COO)]·2CHCl3}n , (III), respectively. Complex (I) has a mononuclear structure, the MnII centre adopting a distorted square-pyramidal coordination. Complex (II) also has a mononuclear structure, with the MnII centre occupying a special position (C 2 symmetry) and adopting a distorted octahedral coordination environment, which is defined by two O atoms and four N atoms from two N'-[1-(pyrazin-2-yl)ethylidene]nicotinohydrazidate (L-) ligands related via a crystallographic twofold axis. Complex (III) features a unique three-dimensional network with rectangular channels, and the L- ligand also serves as a counter-anion. The coordination geometry of the CdII centre is pentagonal bipyramidal. This study demonstrates that HL, which can act as either a neutral or a mono-anionic ligand, is useful in the construction of interesting metal-organic compounds.
机译：由烟酰肼与乙酰基吡嗪的缩合反应制备了潜在的五齿配体N'-[1-（吡嗪-2-基）亚乙基]烟酰肼（HL）。 HL与MnCl2，Mn（CH3COO）2和Cd（CH3COO）2的反应得到三种金属配合物，即二氯基{N'-[1-（吡嗪-2-基-κN1）亚乙基]烟酰肼-κ2N'，O}锰（II），[MnCl2（C12H11N5O）]，（I），双{N'-[1-（吡嗪-2-基-κN1）亚乙基]烟肼基-κ2N'，O]锰（II），[Mn （C12H10N5O）2]，（II）和聚[[（（acetato-κ2O，O'）} {μ3-N'-[1-（吡嗪-2-基-κ2N1：N4）亚乙基]烟肼并-κ3N '，O：N1}镉（II）氯仿二溶剂化物]，{[Cd（C12H10N5O）（CH3COO）]·2CHCl3} n，（III）。配合物（I）具有单核结构，MnII中心采用扭曲的方金字塔形配位。配合物（II）也具有单核结构，MnII中心占据特殊位置（C 2对称）并采用扭曲的八面体配位环境，该环境由两个N'-[1- （吡嗪-2-基）亚乙基]烟肼基甲酸酯（L-）配体通过晶体学双轴关联。配合物（III）具有独特的具有矩形通道的三维网络，并且L-配体也用作抗衡阴离子。 CdII中心的配位几何形状为五边形双锥体。这项研究表明，可用作中性或单阴离子配体的HL可用于构建有趣的金属有机化合物。

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