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Na7Sn12: a binary Zintl phase with a two-dimensional covalently bonded tin framework.

Thomas F Fässler1, Stefan Hoffmann

  • 1Eduard-Zintl Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Petersenstrasse 18, D-64287 Darmstadt, Germany. faessler@ac.chemie.tu-darmstadt.de

Inorganic Chemistry
|September 3, 2003
PubMed
Summary

Sodium-7 tin-12 (Na(7)Sn(12)) was synthesized and characterized as a Zintl phase. This intermetallic compound features two-dimensional polyanions of tin, confirming its unique electronic structure.

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Area of Science:

  • Solid State Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Zintl phases are intermetallic compounds exhibiting complex anionic structures.
  • Understanding the electronic and structural properties of novel Zintl phases is crucial for materials science.

Purpose of the Study:

  • To synthesize and characterize the novel Zintl phase Na(7)Sn(12).
  • To elucidate the crystal structure and bonding characteristics of Na(7)Sn(12).
  • To computationally verify the Zintl behavior using electronic structure calculations.

Main Methods:

  • Synthesis via quenching and thermal treatment of elemental sodium and tin.
  • Single crystal X-ray diffraction for structural determination.
  • Extended-Hückel tight-binding calculations and electron localization function (ELF) analysis.

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Main Results:

  • Na(7)Sn(12) was successfully synthesized and single crystals obtained.
  • The crystal structure reveals two-dimensional polyanions [Sn(12)](7-) separated by sodium cations.
  • Electronic structure calculations confirmed localized bonding and validated Na(7)Sn(12) as a Zintl phase.

Conclusions:

  • Na(7)Sn(12) is a new Zintl phase with a unique two-dimensional anionic tin framework.
  • The compound's structure and bonding align with predictions from the 8-N rule for Zintl phases.
  • This discovery expands the known family of Zintl phases and their structural diversity.