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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Silver complexes of 1,1',3,3'-tetrakis(pyrazol-1-yl)propane: the 'quadruple pyrazolyl embrace' as a supramolecular synthon
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Silver complexes of 1,1',3,3'-tetrakis(pyrazol-1-yl)propane: the 'quadruple pyrazolyl embrace' as a supramolecular synthon

机译:1,1',3,3'-四(吡唑-1-基)丙烷的银配合物:作为超分子合成子的“四重吡唑基环抱”

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The reaction between pyrazole and malonaldehyde bis(dimethylacetal) yields the first linked bis(pyrazolyl)methane ligand, CH_2[CH(pz)_2]_2. Reaction of this ligand with Ag(O_3SCF_3) yields [Ag_2{mu-CH_2[CH(pz)_2]}_2](SO_3CF_3)_2 (1). In the solid state 1 contains a dimeric dication with which two ligands sandwich two silver cations forming a bicyclic sixteen-membered ring system. A similar reaction with Ag(NO_3) yields a trimetallic complex [Ag_3{mu-CH_2[CH(pz)_2]_2}_2](NO_3)_3(CH_3CN)_2 (2) that crystallizes from acetonitrle as 2(centre dot)CH_3CN. Both 1 and 2 form supramolecular structures dominated by cooperative pi-pi stacking/CH-pi hydrogen bonding interactions that we term the 'quadruple pyrazolyl embrace.' A Cambridge Structural Database search showed that this interaction is relatively common for metal complexes of simple poly(pyrazolyl)-methane or -borate ligands and occurs in a quarter of all cases.
机译:吡唑与丙二醛双(二甲基缩醛)之间的反应产生了第一个连接的双(吡唑基)甲烷配体CH_2 [CH(pz)_2] _2。该配体与Ag(O_3SCF_3)反应产生[Ag_2 {mu-CH_2 [CH(pz)_2]} _ 2](SO_3CF_3)_2(1)。固态1包含一个二聚体,两个配体将两个银阳离子夹在中间,形成一个双环的十六元环系统。与Ag(NO_3)的类似反应生成三金属配合物[Ag_3 {mu-CH_2 [CH(pz)_2] _2} _2](NO_3)_3(CH_3CN)_2(2)从乙腈中结晶为2(中心点) CH_3CN。 1和2都形成超分子结构,主要由合作的pi-pi堆积/ CH-pi氢键相互作用构成,我们称之为“四重吡唑基拥抱”。剑桥结构数据库的搜索显示,这种相互作用对于简单的聚(吡唑基)甲烷或硼酸酯配体的金属配合物而言相对普遍,并且发生在所有情况的四分之一中。

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