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This summary is machine-generated.

Researchers discovered a stable Cl©Zn6O6- anion with a planar hexacoordinate chlorine atom, extending halogen coordination limits. This unique structure exhibits superhalogen properties and maintains integrity at high temperatures.

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Area of Science:

  • Inorganic Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Halogens typically exhibit coordination numbers up to five.
  • The exploration of novel bonding motifs and hypercoordinate species is an active area of research.

Purpose of the Study:

  • To identify and characterize a stable hypercoordinate halogen species.
  • To investigate the structural, energetic, and electronic properties of the Cl©Zn6O6- anion.
  • To establish principles for designing planar hypercoordinate superhalogens.

Main Methods:

  • High-level coupled cluster calculations (CCSD(T)/aug-cc-pVTZ).
  • Exhaustive potential energy surface exploration.
  • Born-Oppenheimer molecular dynamics simulations.
  • Bonding and electronic structure analyses.

Main Results:

  • Identification of Cl©Zn6O6- as a global minimum with a planar hexacoordinate chlorine atom.
  • Confirmation of thermodynamic stability and structural integrity up to 900 K.
  • Stabilization primarily through multicenter ionic interactions between Cl- and the Zn6O6 ring.
  • Characterization as a superhalogen anion with a significant HOMO-LUMO gap (5.31 eV) and vertical detachment energy (7.40 eV).

Conclusions:

  • The study demonstrates the feasibility of planar hexacoordination in halogens.
  • The coexistence of planar hypercoordination and superhalogen character is established.
  • Provides a framework for designing new planar hypercoordinate superhalogen compounds.