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Ab initio calculations on bismuth cluster polycations.

A N Kuznetsov1, L Kloo, M Lindsjö

  • 1Department of Chemistry, Moscow State University, Russia.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 7, 2001
PubMed
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Computational studies explored bismuth polycations, revealing electron delocalization and 3D aromaticity. Wade's rules showed exceptions, with some species exhibiting meta-stable properties in these novel bismuth clusters.

Area of Science:

  • Computational Chemistry
  • Inorganic Chemistry
  • Quantum Chemistry

Background:

  • Bismuth polycations represent a unique class of inorganic clusters.
  • Understanding their electronic structure and bonding is crucial for predicting their stability and reactivity.
  • Wade's rules are a theoretical framework for predicting the shapes of boron hydride clusters, with potential applicability to other polycations.

Purpose of the Study:

  • To investigate the general properties of bismuth polycationic species.
  • To assess the applicability of Wade's rules to these bismuth systems.
  • To explore the nature of bonding, including electron delocalization and aromaticity.

Main Methods:

  • Ab initio calculations were employed.
  • Hartree-Fock and density functional theory (DFT) methods were utilized.

Related Experiment Videos

  • Calculations covered bismuth polycations of the types Bi(n(n-2))+, Bi(n(n-4))+, and Bi(n(n-6))+ for n = 3-12.

    • Main Results:

    • Several exceptions to Wade's rules were observed for bismuth polycations.
    • Some predicted and calculated minima demonstrated only meta-stable behavior.
    • The bonding in these polycations is characterized by significant electron delocalization and 'three-dimensional aromaticity'.

    Conclusions:

    • Wade's rules require careful consideration when applied to bismuth polycations due to observed exceptions.
    • The electronic structure of bismuth polycations supports a model of high electron delocalization and 3D aromaticity.
    • The meta-stable nature of some species highlights the complexity of their structural and energetic landscape.