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Tetrapotassium nonastannide, K(4)Sn(9).

Constantin Hoch1, Marco Wendorff, Caroline Röhr

  • 1Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 21, Germany.

Acta Crystallographica. Section C, Crystal Structure Communications
|April 5, 2002
PubMed
Summary

Potassium antimonide K(4)Sn(9) features isolated nido-[Sn(9)]4- clusters. These tin clusters, shaped like monocapped square antiprisms, are arranged in a hexagonal close-packed structure with potassium cations.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Materials Science

Background:

  • The study of Zintl phases and their unique cluster structures is crucial for understanding bonding in intermetallic compounds.
  • Potassium compounds with polyanionic main group elements often exhibit novel structural motifs.

Purpose of the Study:

  • To characterize the crystal structure of the new compound K(4)Sn(9).
  • To analyze the bonding and structural features of the tin clusters within the K(4)Sn(9) lattice.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the crystal structure of K(4)Sn(9).
  • Analysis of atomic positions and interatomic distances to identify cluster geometry and packing.

Main Results:

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  • K(4)Sn(9) crystallizes in a new structure type.
  • The structure contains isolated, Wade nido-[Sn(9)]4- cluster anions with approximate C(4v) symmetry (monocapped square antiprisms).
  • Sn-Sn bond distances within the cluster range from 2.9264(9) to 3.348(1) Å, and the cluster anions are arranged in a hexagonal close-packed manner, separated by K+ cations.

Conclusions:

  • K(4)Sn(9) represents a new structure type featuring discrete [Sn(9)]4- clusters.
  • The observed cluster geometry and packing provide insights into the electronic structure and bonding principles in potassium tin compounds.