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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >A tridentate in situ generated ligand that directs the self-assembly of a transition metal complex: Synthesis and structural characterization of cis-dichloro[1-(2-aminoethyl)biguanide]copper(II) monohydrate
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A tridentate in situ generated ligand that directs the self-assembly of a transition metal complex: Synthesis and structural characterization of cis-dichloro[1-(2-aminoethyl)biguanide]copper(II) monohydrate

机译：三齿原位生成的配体，其指导过渡金属配合物的自组装：顺式二氯[1-（2-氨基乙基）双胍]铜（II）的合成与结构表征

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摘要

One mononuclear penta-coordinated Cu(II) complex, [CuLCl2] . H2O (1), where L is a tridentate ligand H2N-(CH2)(2)-N=C(NH2)-NH-C(NH2)=NH [=1-(2-aminoethyl)biguanide], has been synthesized and characterized crystal lographically. In an attempt to prepare bis(ethylenediamine)bis(biguanide)Cu(II) it, resulted in a different product, [CuLCl2] . H2O (1), where Cu(II) was found to occupy the base of a square pyramid formed by N302 coordination. The ligand L is believed to be generated in situ in presence of Cu(II), since neither L can be prepared independently nor it can be removed from complex 1. Similar attempts with Ni(II) Co(II), Zn(II), Fe(II) or Fe(III) salts failed, and we conclude that Cu(II) acted as a template for the formation of 1. The solid-state structure of 1 is interesting because one monomeric unit, i.e. [CuLCl2] self-recognizes other monomeric unit centrosymmetrically to form a supramolecular dimer through N-H center dot center dot center dot Cl hydrogen bonding. The single lattice water molecule played an important role in the formation of 2D supramolecular sheets involving these dinners and become an integral part of such self-assembled structure. The EPR spectrum of complex I in the frozen state is consistent with a typical monomeric tetragonal Cu(II) environment. Electrochemical study of 1 in aqueous medium showed an irreversible reductive response at -0.65 V versus SCE, which can be assigned to Cu-II/Cu-I redox couple. (C) 2008 Elsevier Ltd. All rights reserved.
机译：一种单核五配位的Cu（II）配合物[CuLCl2]。已经合成了H2O（1），其中L是三齿配体H2N-（CH2）（2）-N = C（NH2）-NH-C（NH2）= NH [= 1-（2-氨基乙基）双胍]并在晶体学上表征晶体。在尝试制备双（乙二胺）双（双胍）Cu（II）时，得到了另一种产物[CuLCl2]。 H2O（1），其中发现Cu（II）占据了由N302配位形成的方形金字塔的底部。据信配体L是在Cu（II）存在下原位产生的，因为L既不能独立制备也不能从络合物1中除去。用Ni（II）Co（II），Zn（II）进行类似的尝试。 ，Fe（II）或Fe（III）盐失效，我们得出结论，Cu（II）充当形成1的模板。1的固态结构很有趣，因为一个单体单元即[CuLCl2]本身-通过NH中心点中心点中心点Cl氢键中心对称地识别其他单体单元以形成超分子二聚体。单个晶格水分子在涉及这些晚餐的二维超分子片的形成中起着重要作用，并成为这种自组装结构的组成部分。处于冷冻状态的配合物I的EPR谱与典型的单体四方Cu（II）环境一致。在水介质中对1的电化学研究表明，相对于SCE，在-0.65 V时有不可逆的还原反应，这可以归因于Cu-II / Cu-I氧化还原对。 （C）2008 Elsevier Ltd.保留所有权利。

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