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Planar pentacoordinate carbon atoms embedded in a metallocene framework.

Zhong-Hua Cui1, Valentin Vassilev-Galindo2, José Luis Cabellos2

  • 1Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China. yhdd@jlu.edu.cn.

Chemical Communications (Cambridge, England)
|December 9, 2016
PubMed
Summary
This summary is machine-generated.

Researchers report stable planar pentacoordinate carbon (ppC) systems. These novel carbon structures, embedded in metallocene frameworks, show promise for experimental realization in the gas phase.

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Area of Science:

  • Organometallic Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Planar pentacoordinate carbon (ppC) represents a unique bonding arrangement challenging traditional chemical principles.
  • Metallocene frameworks offer a promising scaffold for stabilizing unusual molecular geometries.
  • Understanding the electronic factors governing the stability of novel carbon structures is crucial for synthetic chemistry.

Purpose of the Study:

  • To report the theoretical design and characterization of viable planar pentacoordinate carbon (ppC) systems.
  • To investigate the potential for experimental realization of these ppC systems.
  • To elucidate the electronic principles dictating the stability of ppC embedded in metallocene frameworks.

Main Methods:

  • Detailed global minima search using computational chemistry methods.
  • Analysis of electronic structure and bonding characteristics.
  • Evaluation against established chemical rules like the 18-electron rule.

Main Results:

  • Identification of CAl4MX2 (M = Zr, Hf; X = F-I, C5H5) clusters as suitable candidates for ppC systems.
  • Demonstration that these ppC systems can be stabilized within a metallocene framework.
  • Confirmation that the 18-electron rule and electron delocalization are key to stabilizing these ppC structures.

Conclusions:

  • Viable planar pentacoordinate carbon systems bonded to transition metals and within metallocenes are theoretically achievable.
  • The reported CAl4MX2 clusters are promising targets for gas-phase experimental synthesis.
  • Electronic stabilization through the 18-electron rule and electron delocalization is critical for the existence of these novel carbon structures.