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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >A coordinatively flexible hexadentate ligand gives structurally isomeric complexes M2(L)X3 (M = Cu, Zn; X = Br, Cl)
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A coordinatively flexible hexadentate ligand gives structurally isomeric complexes M2(L)X3 (M = Cu, Zn; X = Br, Cl)

机译：配位柔性六齿配体给出结构异构体复合物M2（L）X3（M = Cu，Zn; X = Br，Cl）

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摘要

Polypyridyl multidentate ligands based on ethylenediamine backbones are important metal-binding agents with applications in biomimetics and homogeneous catalysis. The seemingly hexadentate tpena ligand [systematic name: N,N,N′-tris(pyridin-2-ylmethyl)ethylenediamine-N′-acetate] reacts with zinc chloride and zinc bromide to form trichlorido[μ-N,N,N′-tris(pyridin-2-ylmethyl)ethylenediamine-N′-acetato]dizinc(II), [Zn2(C22H24N5O2)Cl3], and tribromido[μ-N,N,N′-tris(pyridin-2-ylmethyl)ethylenediamine-N′-acetato]dizinc(II), [Zn2Br3(C22H24N5O2)]. One ZnII ion shows the anticipated N5O coordination in an irregular six-coordinate site and is linked by an anti carboxylate bridge to a tetrahedral ZnX3 (X = Cl or Br) unit. In contrast, the CuII ions in aquatribromido[μ-N,N,N′-tris(pyridin-2-ylmethyl)ethylenediamine-N′-acetato]dicopper(II)–tribromido[μ-N,N,N′-tris(pyridin-2-ylmethyl)ethylenediamine-N′-acetato]dicopper(II)–water (1/1/6.5) [Cu2Br3(C22H24N5O2)][Cu2Br3(C22H24N5O2)(H2O)]·6.5H2O, occupy two tpena-chelated sites, one a trigonal bipyramidal N3Cl2 site and the other a square-planar N2OCl site. In all three cases, electrospray ionization mass spectra were dominated by a misleading ion assignable to [M(tpena)]+ (M = Zn2+ and Cu2+).
机译：基于乙二胺主链的多吡啶基多齿配体是重要的金属结合剂，可用于仿生和均相催化中。看起来像六齿的萜烯配体[系统名称：N，N，N'-三（吡啶-2-基甲基）乙二胺-N'-乙酸盐]与氯化锌和溴化锌反应形成三氯化物[μ-N，N，N' -三（吡啶-2-基甲基）乙二胺-N'-乙酰基]二嗪（II），[Zn2（C22H24N5O2）Cl3]和三溴代[μ-N，N，N'-三（吡啶-2-基甲基）乙二胺-N'-乙酰基]二嗪（II），[Zn2Br3（C22H24N5O2）]。一个ZnII离子在不规则的六坐标位点显示出预期的N5O配位，并通过抗羧酸盐桥连接到四面体ZnX3（X = Cl或Br）单元上。相反，水溴代[μ-N，N，N'-三（吡啶-2-基甲基）乙二胺-N'-乙酰基]双铜（II）-三溴代[μ-N，N，N'-tris （吡啶-2-基甲基）乙二胺-N'-乙酰基]双铜（II）-水（1/1 / 6.5）[Cu2Br3（C22H24N5O2）] [Cu2Br3（C22H24N5O2）（H2O）]·6.5H2O，占据两个tpena螯合位点，一个是三角形的双锥体N3Cl2位点，另一个是方形的N2OC1位点。在所有这三种情况下，电喷雾电离质谱均由可分配给[M（tpena）] +（M = Zn2 +和Cu2 +）的误导离子所控制。

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