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New Layered Polyborates Cs(2)M(2)B(10)O(17) (M = Na, K).

Jun-Ming Tu1, Douglas A. Keszler

  • 1Department of Chemistry and Center for Advanced Materials Research, Oregon State University, Gilbert Hall 153, Corvallis, Oregon 97331-4003.

Inorganic Chemistry
|January 17, 1996
PubMed
Summary

New cesium polyborates, Cs(2)M(2)B(10)O(17) (M = Na, K), were synthesized and structurally characterized. These compounds feature a novel 2D borate framework with cesium and alkali metal ions integrated within its layers.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Materials Science

Background:

  • Polyborates are a class of inorganic compounds containing boron-oxygen polyanions.
  • Understanding the structural diversity of polyborates is crucial for developing new materials with tailored properties.

Purpose of the Study:

  • To synthesize and characterize novel polyborate compounds with the formula Cs(2)M(2)B(10)O(17), where M = Na or K.
  • To elucidate the crystal structures of these new compounds and identify their structural features.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the precise atomic arrangements.
  • Crystallographic data, including unit-cell parameters and space group, were meticulously analyzed.

Main Results:

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  • The synthesis of two new polyborates, Cs(2)Na(2)B(10)O(17) and Cs(2)K(2)B(10)O(17), was achieved.
  • These compounds crystallize in the monoclinic space group C2/c.
  • A novel 2-dimensional borate matrix, formed by the condensation of B(5)O(11) rings, was identified. Cesium ions are incorporated within this matrix, while sodium/potassium ions are located between the layers.

Conclusions:

  • The study reveals a new structural type of polyborate with a unique 2D framework.
  • The findings contribute to the understanding of boron-oxygen structural chemistry and the incorporation of alkali metal cations within inorganic frameworks.