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Related Experiment Videos

Dodecamethyl-closo-dodecaborate(2-).

T Peymann1, C B Knobler, S I Khan

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, 90095-1569, USA.

Inorganic Chemistry
|April 13, 2001
PubMed
Summary
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This study details the synthesis and characterization of dodecamethyl-closo-dodecaborate(2-) and its radical cation. These boron clusters exhibit stable icosahedral structures, with potential applications in materials science.

Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Boron Cluster Chemistry

Background:

  • Dodecaborate clusters are of interest due to their unique structures and potential applications.
  • Previous research has focused on the synthesis and properties of various closo-dodecaborate derivatives.
  • Understanding the structural and electronic properties of methylated dodecaborates is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and characterize bis(tetraethylammonium) dodecamethyl-closo-dodecaborate(2-).
  • To investigate the structural properties of the closo-dodecaborate dianion in different salt forms.
  • To explore the one-electron oxidation of the dianion to form a stable radical cation.

Main Methods:

  • Modified Friedel-Crafts reaction for the synthesis of [NEt(4)](2)[closo-B(12)Me(12)].

Related Experiment Videos

  • Cation-exchange procedures for preparing alkali metal salts.
  • X-ray crystallography for solid-state structure determination of various salts.
  • One-electron oxidation using ceric(IV) ammonium nitrate.

    • Main Results:

    • Successful synthesis of bis(tetraethylammonium) dodecamethyl-closo-dodecaborate(2-) with good water solubility.
    • Structural analysis revealed nearly perfect icosahedral B(12) clusters in closo-[AsPh(4)](2)2 and distorted icosahedra in [Py(2)CH(2)]2.
    • The blue, air-stable radical [hypercloso-B(12)Me(12)](*-) was synthesized and characterized, showing identical icosahedral geometry to the closo-anion.

    Conclusions:

    • The synthesis of dodecamethyl-closo-dodecaborate(2-) and its alkali metal salts is feasible.
    • The B(12) cluster geometry remains largely intact upon one-electron oxidation.
    • The formation of a charge-transfer complex in the [Py(2)CH(2)]2 salt highlights interesting solid-state interactions.