Subgroup 4 On-Surface Supramolecular Self-Assembly




由于二维金属配位超分子结构的平面特性和相对较大尺寸(5-50 nm),特别适合使用STM直接其精细结构。采用溶液滴涂、真空直接接触转移、制备级质谱软着陆等多种方法可适用不同的样品需求。





Scanning Tunneling Microscopy (STM) can obtain atomic-level resolution images of single molecules, surface self-assembly, and surface polymerization reaction products. Combing with scanning tunneling spectroscopy (STS), which can detect the electrical and magnetic properties of single molecules (such as molecular energy levels, spin states, ferromagnetic interactions, etc.), STM has become an effective method for molecular structure determination, understanding of precise reaction mechanisms and single-molecule manipulation. Based on this technology, our research directions mainly focus on:

(1) STM characterization of supramolecules and polymers which are synthesized in solution
Due to the plane feature and relatively large size (5-50 nm), the fine structure of 2D metal-coordinated supramolecules are very suitable to be detected by STM. Using the methods such as solution drop-casting, vacuum direct contact transfer, and soft-landing through preparative mass spectrometry, different sample requirements can be satisfied.

(2) On-surface synthesis of low-dimensional supramolecules and polymers
Molecular beam epitaxy provides a new approach for bottom-up growth of zero-dimensional macrocycles, 1D and 2D frameworks. Through Ullmann and Glaser coupling reactions and coordination reactions, atomically precise structures can be synthesized on the metal surface. Meanwhile, the precision of product can be regulated through weak interactions such as hydrogen and coordination bonds. The precise structure regulation and various functional groups can further improve the explore of novel structures and functions.

(3) Self-assembly and electronic and magnetic properties of supramolecules on surface
Molecular spintronic materials may be applied for information storage and computation at single-molecule level. Different magnetic functional groups can be introduced into 2D supramolecules and then form regular self-assembly on surface. After introducing electric field and magnetic field, we can manipulate and read each magnetic center in the supramolecule by STM tip, fulfilling the information writing and reading. This kind of materials would be further used for single-molecule information storage and quantum devices.

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