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首页> 外文期刊>Nature nanotechnology >Quantitative assessment of intermolecular interactions by atomic force microscopy imaging using copper oxide tips
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Quantitative assessment of intermolecular interactions by atomic force microscopy imaging using copper oxide tips

机译：用铜氧化铜模拟原子力显微镜成像的分子间相互作用的定量评估

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Atomic force microscopy is an impressive tool with which to directly resolve the bonding structure of organic compounds(1-5). The methodology usually involves chemical passivation of the probe-tip termination by attaching single molecules or atoms such as CO or Xe (refs (1,6-9)). However, these probe particles are only weakly connected to the metallic apex, which results in considerable dynamic deflection. This probe particle deflection leads to pronounced image distortions, systematic overestimation of bond lengths, and in some cases even spurious bond-like contrast features, thus inhibiting reliable data interpretation(8-12). Recently, an alternative approach to tip passivation has been used in which slightly indenting a tip into oxidized copper substrates and subsequent contrast analysis allows for the verification of an oxygen-terminated Cu tip(13-15). Here we show that, due to the covalently bound configuration of the terminal oxygen atom, this copper oxide tip (CuOx tip) has a high structural stability, allowing not only a quantitative determination of individual bond lengths and access to bond order effects, but also reliable intermolecular bond characterization. In particular, by removing the previous limitations of flexible probe particles, we are able to provide conclusive experimental evidence for an unusual intermolecular N-Au-N three-centre bond. Furthermore, we demonstrate that CuOx tips allow the characterization of the strength and configuration of individual hydrogen bonds within a molecular assembly.
机译：原子力显微镜是一种令人印象深刻的工具，可以直接解析有机化合物的粘合结构（1-5）。该方法通常涉及通过附着单分子或诸如CO或Xe（Refs（1,6-9））的单分子或原子来进行探针末端的化学钝化。然而，这些探针颗粒仅弱连接到金属顶点，这导致相当大的动态偏转。该探测粒子偏转导致图像失真，系统高估，粘合长度，并且在某些情况下甚至是虚假的键相同的对比度特征，从而抑制可靠的数据解释（8-12）。最近，已经使用了尖端钝化的替代方法，其中稍微缩进尖端进入氧化铜基板和随后的对比度分析允许验证氧封端的Cu尖端（13-15）。在这里，我们表明，由于末端氧原子的共价绑定配置，该氧化铜尖端（CuOx尖端）具有高结构稳定性，不仅允许各个键长度的定量测定和获得键均衡效应，还允许获得键合订单效应的定量测定可靠的分子间结合表征。特别地，通过去除柔性探针颗粒的先前限制，我们能够为不寻常的分子间N-AU-N三中心键提供确凿的实验证据。此外，我们证明CUOX提示允许表征分子组件内单个氢键的强度和构型。

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