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A new high-pressure polymorph of K2MoO2F4
Fabian Zimmerhofer1, Hubert Huppertz1
1University of Innsbruck, Institute of General, Inorganic and Theoretical Chemistry, Innrain 80-82, 6020, Innsbruck, Austria. Hubert.Huppertz@uibk.ac.at.
Dalton Transactions (Cambridge, England : 2003)
|November 14, 2023
Summary
Researchers discovered a new high-pressure polymorph of the oxyfluoride K2MoO2F4. This novel crystal structure was characterized using single-crystal X-ray diffractometry and computational methods.
Area of Science:
- Solid-state chemistry
- Crystallography
- Materials science
Background:
- Potassium oxyfluoride compounds are known for their diverse structural properties.
- Understanding structural behavior under high pressure is crucial for materials science.
Purpose of the Study:
- To synthesize and characterize a new high-pressure polymorph of K2MoO2F4.
- To elucidate the crystal structure and properties of this new phase.
Main Methods:
- Single-crystal X-ray diffractometry for structure determination.
- Bond valence (BV), charge distribution (CHARDI), and Madelung part of lattice energy (MAPLE) calculations for structural validation.
- Infrared spectroscopy for phase analysis.
Main Results:
- A new monoclinic high-pressure polymorph of K2MoO2F4 (space group C2/m) was identified.
- Detailed crystallographic data including cell parameters (a = 13.8579(5), b = 5.8109(2), c = 6.9442(3) Å, β = 90.36(1)°) were obtained.
- Computational methods supported the structural assignment of oxygen and fluorine anions.
Conclusions:
- The high-pressure polymorph of K2MoO2F4 exhibits a distinct crystal structure compared to its ambient-pressure form.
- The study provides valuable insights into the pressure-induced structural transformations of oxyfluorides.
- Further investigations into the properties and potential applications of this HP polymorph are warranted.
