Trapping cations in specific positions in tuneable "artificial cell" channels:: New nanochemistry perspectives
Trapping cations in specific positions in tuneable "artificial cell" channels:: New nanochemistry perspectives
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DOI：
10.1002/anie.200352358
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发表时间：
2003-01-01
影响因子：
16.6
通讯作者：
Zhang, LJ
中科院分区：
文献类型：
--
作者：
Müller, A;Das, SK;Zhang, LJ
分子尺寸的孔可以用作过滤器，但也可以捕获具有明确形状的分子。虽然大量具有笼和隧道的多孔材料作为扩展结构存在，[1]但对定义明确的离散（分子）纳米多孔物质知之甚少。如果可以预测特定底物对特定胶囊区域的亲和力，则涉及底物（例如阳离子）进入的过程特别令人感兴趣。这现在对于基于稳健的基本骨架（R12）12（连接体）30 f1 {（Mo）Mo 5 O21（H2O）6} 12 {Mo 2 O 4（配体）} 30 [2，3]的纳米尺寸球形胶囊是可能的，所述纳米尺寸球形胶囊具有相当大的孔、精细可雕刻的内部以及在其间的具有前所未有的分子级过滤器性质的可调谐功能化通道。这里将首次讨论这些问题。最重要的是，通道功能以及胶囊大小和电荷可以广泛变化，而电荷调制导致与阳离子亲和力的相关变化！在这里，我们表明，不同的基板/阳离子可以固定在上面，下面，特别是在通道中的明确定义的位置。[3]这种情况使我们能够研究，在原则上，新类型的分子传输现象，包括南极型的，在纳米尺度上，并显示了“纳米离子色谱仪”的属性。[4]此外，人们可以构建新的几何形状，例如从进入阳离子的互穿固体，这是因为我们在通道、孔和内部有许多不同和等同的位点（另见参考文献104）。[3b]）。这也使我们能够研究物质在受限条件下的性质。为了研究阳离子和底物的摄取，我们使用了已知的胶囊1a [3]以及新的
Molecular dimensioned holes can serve as filters but also trap molecules with well-defined shapes. Whereas a large number of porous materials with cages and tunnels exist as extended structures,[1] as yet not much is known about well-defined, discrete (molecular) nanoporous species. Processes that refer to the entrance of substrates (eg of cations) are of particular interest if the affinity of specific substrates to specific capsule areas can be predicted. This is now possible for nanosized spherical capsules based on the robust fundamental skeleton (pent) 12 (linker) 30ffi {(Mo) Mo5O21 (H2O) 6} 12 {Mo2O4 (ligand)} 30 [2, 3] which has sizeable pores, finely sculpturable interiors and, in between, tuneable functionalized channels with unprecedented molecular-scale filter properties. These will be discussed here for the first time. Most importantly, the channel functionalities as well as the capsule size and charge can be extensively varied, while charge modulations lead to related changes in the affinity to cations! Herein we show that different substrates/cations can be fixed at well-defined positions above, below, and especially in the channels.[3] This situation allows us to study, in principle, new types of molecular transport phenomena, including osmotic-type ones, on the nanoscale, and shows properties of a “nano-ion chromatograph”.[4] Additionally, one can construct new geometries such as interpenetrating solids from entering cations owing to the fact that we have a multitude of different as well as equivalent sites in the channels, pores, and in the interior (see also ref.[3b]). This also allows us to study properties of matter under confined conditions. For the investigations into the uptake of cations and substrates, we used the known capsule 1a [3] as well as the new