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Related Experiment Video

Updated: Feb 7, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Electronic Structure Modulation via Composition-Preserving Phase Transformations in Metal-Organic Assemblies on the

Hyungjun Park1,2, Emiko Kazuma1,2, Minhui Lee1,2

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo, Tokyo, Japan.

Small (Weinheim an Der Bergstrasse, Germany)
|February 6, 2026
PubMed
Summary

This study reveals a room-temperature phase transformation in metal-organic assemblies without changing chemical composition. This geometric relaxation strengthens interactions, tuning electronic structure for advanced nanomaterials.

Keywords:
density functional theorymetal‐organic coordinationphase transformation on surfacescanning tunneling microscopyscanning tunneling spectroscopy

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Area of Science:

  • Surface science
  • Supramolecular chemistry
  • Materials science

Background:

  • Metal-organic coordination assemblies offer tunable platforms for functional nanostructures.
  • Understanding electronic structure tuning via factors like precursor design and substrate choice is crucial for rational design.
  • Phase transformations significantly alter properties, but studies on composition-preserving geometric relaxation are limited.

Purpose of the Study:

  • To demonstrate a room-temperature phase transformation in a supramolecular self-assembly.
  • To investigate composition-preserving geometric relaxation and its effect on electronic structure.
  • To provide a new route for modulating physicochemical functionalities in surface-confined molecular architectures.

Main Methods:

  • Utilized scanning tunneling microscopy and spectroscopy.
  • Employed density functional theory calculations.
  • Tracked stepwise transformation among three distinct hexagonal lattices on Ag(111) using Ag-carboxylate complexes derived from 3,5-dinitrobenzoic acid.

Main Results:

  • Observed a room-temperature phase transformation in Ag-carboxylate assemblies without altering chemical composition.
  • Identified subtle geometric relaxation that enhances metal-molecule interactions.
  • Demonstrated modulation of the collective electronic structure through this transformation.

Conclusions:

  • A composition-preserving, phase-transformation-driven route can modulate electronic structures in metal-organic coordination assemblies.
  • This approach enables tuning of physicochemical functionalities in surface-confined molecular architectures.
  • Geometric relaxation, without chemical changes, offers a novel method for controlling nanomaterial properties.