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Liquid-Assisted Mechanochemical Synthesis of Cesium Copper(II) Halogenides
Nikola Biliškov1,2, Valentina Martinez1, Igor Milanović3
1Rud̵er Bošković Institute , Bijenička c. 54, Zagreb10000, Croatia.
Liquid additives in inorganic mechanochemistry influence reaction pathways and outcomes. Different liquid types, especially coordinating ones, create solvates and alter reaction kinetics, revealing a non-universal role for liquids in mechanochemical synthesis.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Mechanochemistry
Background:
- Mechanochemical reactions offer solvent-free synthesis routes.
- Understanding liquid additive roles is crucial for controlling reaction pathways.
- Cesium copper(II) halogenides are an important class of inorganic compounds.
Purpose of the Study:
- To investigate the influence of liquid additives on inorganic mechanochemical reactions.
- To elucidate the mechanistic pathways of cesium copper(II) halogenide formation.
- To compare the role of liquids in inorganic versus organic mechanochemistry.
Main Methods:
- In situ monitoring using synchrotron powder X-ray diffraction (PXRD).
- Liquid-assisted mechanochemical synthesis of Cs2CuCl2X2 (X = Cl or Br).
- Analysis of reaction kinetics and product formation under different liquid conditions.
Main Results:
- Reactions proceed via a common intermediate CsCuCl2X.
- Liquid additives significantly alter reaction kinetics and outcomes.
- Three distinct reaction pathways were identified based on liquid properties (noninteracting, polar, solvate-forming).
- Strongly coordinating liquids can lead to stable solvates and modified reaction mechanisms.
Conclusions:
- Liquid additives play a directional role in inorganic mechanochemical reactions.
- The influence of liquids varies significantly with their polarity and coordinating ability.
- The role of liquids in inorganic mechanochemistry is not general and differs from organic systems.
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