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Ionic Crystal Structures

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Crystal Field Theory
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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IrF8 Molecular Crystal under High Pressure.

Jianyan Lin1, Ziyuan Zhao1, Chunyu Liu1

  • 1Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education , Northeast Normal University , Changchun 130024 , China.

Journal of the American Chemical Society
|March 14, 2019
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Scientists discovered a new Iridium(VIII) fluoride (IrF8) compound under high pressure. This F-rich material exhibits strong oxidizing potential, surpassing existing agents and opening avenues for novel chemical applications.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Transition metal fluorides are crucial for high oxidation states and applications as oxidizing/fluorinating agents.
  • The highest known F stoichiometry in neutral transition metal fluorides is 7.
  • Exploring F-rich compounds is key to advancing oxidation chemistry.

Purpose of the Study:

  • To identify novel F-rich transition metal fluorides.
  • To investigate the properties and stability of high-stoichiometry iridium fluorides.
  • To explore the potential of these compounds as powerful oxidizing agents.

Main Methods:

  • First-principles swarm-intelligence structure search calculations.
  • High-pressure simulations to predict stable phases.
  • Analysis of electronic structure and oxidation states.

Main Results:

  • Identification of a new IrF8 compound with an Iridium (+8) oxidation state.
  • Discovery of three distinct IrF8 phases with molecular crystal structures.
  • Observed increase in structural symmetry with increasing pressure.
  • Predicted electron affinities comparable to or exceeding PtF6.

Conclusions:

  • The discovery of IrF8 expands the known limits of F stoichiometry in transition metal fluorides.
  • High pressure facilitates the formation of these F-rich compounds through charge transfer mechanisms.
  • The predicted properties suggest IrF8 as a potent new oxidizing agent.