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Related Experiment Videos

Hypercarbons in polyhedral structures.

Eluvathingal D Jemmis1, Elambalassery G Jayasree, Pattiyil Parameswaran

  • 1Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore -560012, India. jemmis@ipc.iisc.ernet.in

Chemical Society Reviews
|January 31, 2006
PubMed
Summary

Hypercoordinate carbon, with coordination numbers exceeding four, is found in diverse polyhedral structures like carboranes and sandwich complexes. This review explores their structural variety, stability, and theoretical advancements, including wheel-shaped and planar hypercoordinated molecules.

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Area of Science:

  • * Inorganic Chemistry
  • * Materials Science
  • * Theoretical Chemistry

Background:

  • * Carbon typically exhibits tetravalency and tetracoordination.
  • * Exceptions exist, featuring hypercoordinate carbon atoms (coordination number > 4).
  • * These hypercoordinate carbons are observed in various complex structural motifs.

Purpose of the Study:

  • * To review and categorize structural varieties of hypercoordinate carbon compounds.
  • * To explore the potential for novel structural patterns in carboranes.
  • * To discuss the stability of different isomers and theoretical developments.

Main Methods:

  • * Comprehensive literature review of known hypercoordinate carbon structures.
  • * Analysis of condensation modes for predicting carborane structures.

Related Experiment Videos

  • * Application of the mno rule for understanding structural patterns.
  • * Discussion of theoretical studies on novel molecular geometries.

    • Main Results:

    • * Identification of hypercoordinate carbon in polyhedral carboranes, sandwich complexes, encapsulated structures, and planar aromatic systems.
    • * Prediction of extensive structural diversity in carboranes due to varied condensation pathways.
    • * Description of relative stabilities for positional isomers of carboranes and related structures.
    • * Highlighting recent theoretical advancements like wheel-shaped and planar hypercoordinated molecules.

    Conclusions:

    • * Hypercoordinate carbon enables a wide array of complex molecular architectures.
    • * The mno rule provides a framework for predicting structural diversity.
    • * Ongoing theoretical research continues to expand the known landscape of hypercoordinate carbon chemistry.