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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Heavy Metals Make a Chain: A Catenated Bismuth Compound.

Robert D Riley1, Diane A Dickie2,3, Michael A Land1

  • 1Department of Chemistry, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 17, 2020
PubMed
Summary
This summary is machine-generated.

Researchers created the first neutral molecule featuring a bismuth (Bi) chain. This discovery challenges the rarity of catenation in heavy elements and opens new chemical frontiers.

Keywords:
X-ray crystallographybismuthcatenationchain structure

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Area of Science:

  • Inorganic Chemistry
  • Main-Group Chemistry
  • Organometallic Chemistry

Background:

  • Catenation, the linking of atoms to form chains, is prevalent in light main-group elements.
  • However, catenation is exceptionally rare for heavier elements, posing a significant challenge in synthetic chemistry.

Purpose of the Study:

  • To report the synthesis and characterization of the first neutral molecule containing a bismuth (Bi) chain.
  • To investigate the influence of reaction conditions on the formation of bismuth chain compounds.

Main Methods:

  • A one-step synthesis involving bismuth trichloride and bis(diisopropylphosphino)amine in methanol suspension.
  • Spectroscopic characterization (e.g., NMR, Mass Spectrometry) of the synthesized products.
  • Single-crystal X-ray diffraction analysis to confirm molecular structure and bismuth chain formation.

Main Results:

  • Successful synthesis of a neutral molecule featuring a tetra-bismuth (Bi4) chain.
  • Demonstration that the choice of solvent (methanol vs. dichloromethane) drastically alters the reaction outcome.
  • Full structural elucidation of the bismuth chain-containing products.

Conclusions:

  • This work presents the first concrete example of a neutral molecule with a Bi4 chain, expanding the known chemistry of heavy element catenation.
  • The findings highlight the critical role of reaction medium in controlling the assembly of heavy main-group elements.
  • This discovery provides a foundation for exploring novel heavy element chain compounds and their potential applications.