Presentation Information
[3D12]Structural elucidation of hydrogen bonds in single molecular assembly through electromechanical analysis
*Taisei Takahashi1, Tomoaki Nishino1 (1. School of Science, Institute of Science Tokyo)
Precise evaluation of intermolecular interactions in molecular assemblies is crucial for understanding biological functions. We have studied molecular junctions, in which single or a few molecules bridge nanogaps between metal electrodes. Here, we developed an electromechanical methodology for the structural analysis of single dimer junctions. Glycine molecular junction conductance was measured using the STM break-junction technique. Analysis of conductance traces revealed the formation of glycine dimer junctions. Subsequently, a mechanical modulation was applied to the junction via STM tip vibration. The observed electromechanical responses were compared with theoretical estimates for possible hydrogen-bonding motifs. They agreed with each other for a specific hydrogen bond motif, thereby enabling determination of the hydrogen bond structure.