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首页> 外文期刊>Crystal growth & design >N-H center dot center dot center dot Cl-2-M synthon as a structure-directing tool: Crystal structures of some perchlorometallates
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N-H center dot center dot center dot Cl-2-M synthon as a structure-directing tool: Crystal structures of some perchlorometallates

机译:N-H中心点中心点中心点Cl-2-M合成子作为结构指导工具:某些高氯酸金属盐的晶体结构

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摘要

A series of perchlorometallate salts, namely, [4,4'-H(2)diazastilbene][PdCl4] 1; [H-2-N-(4-pyridyl)isonicotinamide][MCl4], M = Pt(II) 2, M = Pd(II) 2a; [H-2-N,N'-bis(4-pyridyl)urea][MCl4], M = Pt(II) 3, M = Pd(II) 3a; [H-2-N-(3-pyridyl)isonicotinamide][MCl4], M = Pt(II) 4, M = Pd(II) 4a; [H-2-N-(4-pyridyl)nicotinamide][PtCl4] 5; [H-2-N,N'-bis(3-pyridyl)urea][PtCl4] 6, have been synthesized and analyzed by single-crystal X-ray diffraction to study the frequency of occurrence, robustness, and reliability (as structure directing tools) of the bifurcated hydrogen bonding of the type N-H center dot center dot center dot Cl-2-M (synthon A). The results indicate that synthon A is indeed quite robust and reliable as structure-directing tool when the interacting cationic and anionic species are rigid. Structural parameters for synthon A indicate that the N-H center dot center dot center dot Cl2M bifurcated hydrogen-bonding moiety is generally asymmetric and a "face approach" is more preferred in salts (4-6) derived from dications having angular cationic topology, whereas a nearly "edge approach" is preferred in salts (1-3a) derived from dications having linear cationic topology. Hydrogen-bonding interactions of the type N/C-H center dot center dot center dot Pt are present in all the Pt salts except in 4, whereas no such interactions are observed in the cases of Pd salts. The metal center of the anionic moiety seems to have a profound effect on the molecular geometry of the cationic species as well as on the overall supramolecular architecture of the salts.
机译:一系列的全氯金属酸盐,即[4,4'-H(2)二氮杂sti] [PdCl4] 1; [H-2-N-(4-吡啶基)异烟酰胺] [MCl4],M = Pt(II)2,M = Pd(II)2a; m = Pt(II)2a。 [H-2-N,N′-双(4-吡啶基)脲] [MCl4],M = Pt(II)3,M = Pd(II)3a; [H-2-N-(3-吡啶基)异烟酰胺] [MCl4],M = Pt(II)4,M = Pd(II)4a; M = Pt(II)4a。 [H-2-N-(4-吡啶基)烟酰胺] [PtCl4] 5;合成了[H-2-N,N'-双(3-吡啶基)脲] [PtCl4] 6,并通过单晶X射线衍射进行了分析,以研究其出现的频率,稳健性和可靠性(作为结构) NH中心点中心点中心点中心点Cl-2-M(合成子A)类型的氢键分叉。结果表明,当相互作用的阳离子和阴离子种类是刚性的时,合成子A作为结构导向工具确实非常强大和可靠。合成子A的结构参数表明NH中心点中心点中心点Cl2M分叉的氢键部分通常是不对称的,并且在衍生自具有角阳离子拓扑结构的盐的盐(4-6)中更优选“面法”,而在衍生自具有线性阳离子拓扑结构的阳离子的盐(1-3a)中,最好采用“边缘法”。除了4以外,所有Pt盐中都存在N / C-H中心点中心点中心点中心点Pt类型的氢键相互作用,而在Pd盐的情况下未观察到这种相互作用。阴离子部分的金属中心似乎对阳离子物质的分子几何形状以及盐的总体超分子结构具有深远的影响。

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