近场红外纳米光谱揭示了金属有机骨架单晶中的客体限制
Near-field infrared nanospectroscopy reveals guest confinement in metal-organic framework single crystals
摘要：
金属有机框架（MOFs）可以为分子客体包封提供特殊的孔隙率，用于传感、气体储存、药物递送和光电子学中的紧急应用。然而，实现这些应用程序的核心是成功地将功能性客人限制在主机框架内。在这里，我们证明，第一次，散射型扫描近场光学显微镜（S-SNOM）和纳米傅里叶变换红外（nanoFTIR）光谱的可行性，在音乐会与密度泛函理论（DFT）计算，以揭示振动特性的来宾@MOF系统。通过探测单个MOF晶体，我们确定了局部分子的振动，从而为纳米级的主客体相互作用提供了新的线索。我们的策略不仅证实了在单晶中的多孔主体框架中成功封装发光客体分子，而且进一步为纳米尺度分辨的物理和化学鉴定提供了一种新的方法，用于广泛的框架材料和设计师多孔系统的高级应用。
英文摘要：
Metal-organic frameworks (MOFs) can provide exceptional porosity for molecular guest encapsulation useful for emergent applications in sensing, gas storage, drug delivery and optoelectronics. Central to the realisation of such applications however is the successful incorporation of a functional guest confined within the host framework. Here we demonstrate, for the first time, the feasibility of scattering-type scanning near-field optical microscopy (s-SNOM) and nano-Fourier transform infrared (nanoFTIR) spectroscopy, in concert with density functional theory (DFT) calculations to reveal the vibrational characteristics of the Guest@MOF systems. Probing individual MOF crystals, we pinpoint the local molecular vibrations and thus, shed new light on the host-guest interactions at the nanoscale. Our strategy not only confirms the successful encapsulation of luminescent guest molecules in the porous host framework in single crystals, but further provides a new methodology for nanoscale-resolved physical and chemical identification of wide-ranging framework materials and designer porous systems for advanced applications.
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