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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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Water-Triggered Structural Transformation in a Silver Chalcogenolate Cluster-Based MOF (SCC-MOF) Enables Visually

Kai Ma1, Fan Liu1, Hui-Na Ma1

  • 1Henan Key Laboratory of Crystalline Molecular Functional Materials, College of Chemistry, Zhengzhou University, Zhengzhou, China.

Advanced Materials (Deerfield Beach, Fla.)
|May 28, 2026
PubMed
Summary

A new silver cluster-based metal-organic framework (MOF) provides rapid, visual detection of trace water vapor. This optically readable sensor works at low humidity levels, offering an intuitive alternative to electrical sensors.

Keywords:
coordination regulationsilver chalcogenolate cluster‐based MOFs (SCC‐MOFs)structural transformationtrace water sensing

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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Trace water monitoring is crucial for chemical processes and sensitive materials.
  • Conventional electrical humidity sensors have limitations in instrumentation and visual feedback.
  • Luminescent metal-organic frameworks (MOFs) offer optical water sensing potential, with cluster-assembled types underexplored.

Purpose of the Study:

  • To develop a novel cluster-based MOF for optically readable water vapor detection.
  • To investigate the sensing mechanism of luminescent MOFs upon water exposure.
  • To establish cluster-based MOFs as a viable platform for sensitive humidity sensing.

Main Methods:

  • Synthesis and characterization of a silver chalcogenolate cluster-based MOF (SCC-MOF), Ag12-TCNB.
  • Investigation of luminescence changes upon exposure to varying relative humidity (RH).
  • Structural analysis using single-crystal X-ray diffraction (SCXRD) and powder X-ray diffraction (PXRD).
  • Computational analysis using electronic structure calculations.

Main Results:

  • The Ag12-TCNB SCC-MOF exhibits an orange-to-yellow luminescence transition upon water exposure.
  • Naked-eye detection of water vapor is achieved at relative humidity levels below 1.26%.
  • Water molecules coordinate with the Ag12 cluster nodes, inducing lattice displacement and altering excited states.

Conclusions:

  • Cluster-based MOFs, specifically Ag12-TCNB, are effective for optically readable water vapor sensing.
  • The observed luminescence shift provides a rapid and intuitive method for detecting trace moisture.
  • This study highlights the potential of cluster-assembled MOFs for advanced sensing applications.