(RPh₃P)[Mn(dca)₃]: A Family of Glass-Forming Hybrid Organic-Inorganic Materials

Area of Science:

• Materials Science
• Solid-State Chemistry
• Crystallography

Background:

• ABX3-type hybrid organic-inorganic structures are a novel class of meltable materials.
• Understanding the liquid and glass-forming behavior of these materials is crucial for their application.
• Phenylphosphonium derivatives offer a new avenue for tuning the properties of hybrid materials.

Purpose of the Study:

• To investigate the liquid- and glass-forming behavior of a new family of hybrid structures, (RPh3P)[Mn(dca)3].
• To analyze the structure and properties of these materials in both crystalline and glassy states.
• To explore the potential applications of these tunable hybrid materials.

Main Methods:

• Synthesis of (RPh3P)[Mn(dca)3] compounds with R = Me, Et, Ph.
• Variable-temperature Powder X-ray Diffraction (PXRD) for in situ glass formation studies.
• Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy and synchrotron X-ray total scattering (pair distribution function) for structural analysis.
• Evaluation of mechanical, thermal, and electrical properties.

Main Results:

• The new compounds melt between 196-237 °C and vitrify upon cooling, forming glasses.
• Structural analyses confirmed the formation of glasses with tunable properties.
• The glasses exhibited promising mechanical durability, low thermal conductivity (κ ≈ 0.07-0.09 W m⁻¹ K⁻¹), and moderate electrical conductivity (σ ≈ 10⁻⁴-10⁻⁶ S m⁻¹).
• Precise control of the A-site cation allows tuning of conductivity from moderate to insulating.

Conclusions:

• Phenylphosphonium-based hybrid materials offer a versatile platform for creating meltable glasses with tunable properties.
• These materials demonstrate potential for applications in photovoltaic devices (thermal management) and thermoelectric energy harvesting.
• The study advances the understanding of structure-property relationships in hybrid organic-inorganic materials.