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Linear triatomic [ZnBi2]4- in K4ZnBi2.

Qian Qin1, Liujiang Zhou, Yi Wang

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China. xli@fjirsm.ac.cn.

Dalton Transactions (Cambridge, England : 2003)
|January 28, 2014
PubMed
Summary

Researchers synthesized the first discrete zinc-bismuth (Zn-Bi) Zintl cluster anion, [ZnBi2](4-), in a solid state. This tetraanionic trimer exhibits a linear structure and multiple Zn-Bi bonds, suggesting potential semiconductor and optical applications.

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Area of Science:

  • Solid-state chemistry
  • Inorganic chemistry
  • Materials science

Background:

  • Zintl phases are intermetallic compounds containing polyanionic clusters.
  • Discrete Zintl cluster anions offer unique structural and electronic properties.
  • Zinc-bismuth (Zn-Bi) systems are underexplored for novel cluster synthesis.

Purpose of the Study:

  • To synthesize and characterize the first discrete Zn-Bi Zintl cluster anion.
  • To investigate the structural, bonding, and electronic properties of the synthesized cluster.
  • To explore the potential of Zn-Bi compounds as novel materials.

Main Methods:

  • Solid-state synthesis from a K-Zn-Bi system.
  • X-ray diffraction for structural determination.
  • Density Functional Theory (DFT) calculations for electronic structure and bonding analysis.
  • Valence electron counting rules for structural prediction.

Main Results:

  • The first discrete linear triatomic Zintl cluster anion, [ZnBi2](4-), was successfully synthesized in K4ZnBi2.
  • The anion exhibits a nearly linear structure (177.3(3)°) with multiple Zn[double bond, length as m-dash]Bi bonds, evidenced by short bond lengths (2.553(3) Å) and DFT π-bonding analysis.
  • DFT calculations using VASP indicate K4ZnBi2 is a narrow-gap direct semiconductor with promising optical properties.

Conclusions:

  • The synthesis of [ZnBi2](4-) expands the family of discrete Zintl cluster anions.
  • The observed structure and bonding are consistent with the 16-electron rule for linear triatomic species.
  • K4ZnBi2 is a promising material for optical applications due to its semiconductor properties.