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首页> 外文期刊>Chemistry: A European journal >Component Selection in the Self-Assembly of Palladium(II) Nanocages and Cage-to-Cage Transformations
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Component Selection in the Self-Assembly of Palladium(II) Nanocages and Cage-to-Cage Transformations

机译：钯（II）纳米笼自组装中的组分选择和笼到笼的转变

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摘要

Dynamic supramolecular systems involving a tetratopic palladium(II) acceptor and three different pyridine- and imidazole-based donors have been used for self-selection by a synergistic effect of morphological information and coordination ability of ligands through specific coordination interactions. Three different cages were first synthesized by twocomponent self-assembly of individual donor and acceptor. When all four components were allowed to interact in a reaction mixture, only one out of three cages was isolated. The preferential binding affinity towards a particular partner was also established by transforming a non-preferred cage into a preferred cage by interaction with the appropriate ligand. Computational studies further supported the fact that coordination interaction of imidazole moiety to PdII is enthalpically more preferred compared to pyridine, which drives the selection process. Analysis of crystal packing of both complexes indicated the presence of strong hydrogen bonds between nitrate and water molecules and also H-bonded 3D networks of water. Both complexes exhibit promising proton conductivity (10~(-5) to ca. 10~(-3) Scm~(-1)) at ambient temperature under a relative humidity of circa 98% with low activation energy.
机译：通过形态信息和配体通过特定配位相互作用的协同作用，涉及四位钯（II）受体和三种不同的吡啶和咪唑基供体的动态超分子系统已用于自我选择。首先通过个体供体和受体的两组分自组装合成三个不同的笼子。当所有四种组分在反应混合物中相互作用时，仅分离出三个笼子中的一个。通过与合适的配体相互作用，将非优选的笼转化为优选的笼，也建立了对特定配偶体的优先结合亲和力。计算研究进一步支持了一个事实，即与吡啶相比，咪唑基团与PdII的配位相互作用在焓上更受青睐，后者驱动选择过程。两种配合物的晶体堆积分析表明，硝酸盐和水分子之间存在强氢键，还有水的H键3D网络。两种配合物在环境温度，相对湿度约为98％，活化能低的情况下均表现出良好的质子传导性（10〜（-5）至约10〜（-3）Scm〜（-1））。

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