Two-Dimensional Coordination Networks from Cyclic Dipeptides,Journal of the American Chemical Society

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Two-Dimensional Coordination Networks from Cyclic Dipeptides
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-11-12 , DOI: 10.1021/jacs.0c08700
Yuanyuan Guo ₁ , Ajiguli Nuermaimaiti ₁ , Niels Due Kjeldsen ₁ , Kurt V. Gothelf _{1,

2} , Trolle R. Linderoth _{1,

3}

Affiliation

Peptide-based biomimetic nanostructures and metal-organic coordination networks on surfaces are two promising classes of hybrid materials which have been explored recently. However, despite the great versatility and structural variability of natural and synthetic peptides, the two directions have so far not been merged in fabrication of metal-organic coordination networks using peptides as building blocks. Here we demonstrate that cyclic peptides can be used as ligands to form highly ordered, two-dimensional, peptide-based metal-organic coordination networks. The networks are formed on a Au(111) surface through coadsorption of cyclic dialanine with Cu-adatoms under Ultra-High Vacuum (UHV) conditions. Scanning Tunneling Microscopy (STM) in combination with X-ray Photoelectron spectroscopy (XPS) has been utilized to characterize the network structures at submolecular resolution and expound the chemical changes involved in network coordination. The networks involve a motif of three cyclic dialanine molecules coordinating to a central Cu-adatom. Interestingly the networks expose pores functionalized by the side chain of the cyclic peptide, suggesting a general method to form functionalized porous metal-organic networks on surfaces.

中文翻译：

来自环状二肽的二维配位网络

基于肽的仿生纳米结构和表面上的金属有机配位网络是最近探索的两类有前途的混合材料。然而，尽管天然和合成肽具有巨大的多功能性和结构可变性，但在使用肽作为构建块的金属 - 有机配位网络的制造中，这两个方向迄今为止尚未融合。在这里，我们证明了环肽可用作配体以形成高度有序的、二维的、基于肽的金属有机配位网络。在超高真空 (UHV) 条件下，通过环状二丙氨酸与 Cu 吸附原子在 Au(111) 表面上形成网络。扫描隧道显微镜 (STM) 与 X 射线光电子能谱 (XPS) 相结合已被用于以亚分子分辨率表征网络结构，并阐述网络配位中涉及的化学变化。该网络涉及三个环状二丙氨酸分子的基序，它们与一个中央 Cu 原子协调。有趣的是，网络暴露了由环肽侧链功能化的孔，这表明了在表面形成功能化多孔金属有机网络的通用方法。

更新日期：2020-11-12

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