Tailoring Hybrid Copper Iodide Cluster Glasses via Ligand Design for Stable Multifunctional X-Ray Imaging

Area of Science:

• Materials Science
• Inorganic Chemistry
• Solid-State Chemistry

Background:

• Developing glassy organic-inorganic hybrid materials is challenging due to issues like unstable melting and poor crystallization resistance.
• Novel approaches are needed to create stable and functional hybrid glasses.

Purpose of the Study:

• To design novel copper iodide cluster glasses through a rational ligand engineering strategy.
• To investigate the effect of ligand structure on the glass properties and stability.

Main Methods:

• Synthesis of zero-dimensional Cu4I4(L)4 cubic clusters using phosphine ligands with phenyl and cyclohexyl groups.
• Variable-temperature X-ray absorption fine structure analysis, Raman spectroscopy, and molecular dynamics simulations.
• Density functional theory and rheological analyses to understand thermodynamic behavior.

Main Results:

• Melting occurs via disruption of intermolecular electrostatic interactions, not ligand dissociation.
• Systematic substitution of phenyl with cyclohexyl groups suppresses crystallization and enables vitrification.
• The resulting Cu4I4(Cy2PhP)4 glass shows a high glass transition temperature (352.3 K), excellent optical transparency, and remarkable stability.

Conclusions:

• Ligand engineering is a feasible design principle for creating stable organic-inorganic hybrid glasses.
• The developed copper iodide cluster glasses have potential applications in high-resolution, underwater, and high-temperature X-ray imaging.
• This work highlights the potential of hybrid glasses for advanced photonic applications.