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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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sp3d and sp3d 2 Hybridization
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Related Experiment Video

Updated: May 10, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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A Stibenium Stabilized by Intramolecular Coordination from a Phosphine.

Shin-Ya Kawamoto1, Koichiro Masada1,2, Takahiro Sasamori1,2

  • 1Graduate School of Science and Technology, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8571, Japan.

Chemistry, an Asian Journal
|April 21, 2025
PubMed
Summary

Researchers synthesized an air-stable bis(ferrocenyl)stibenium compound. This novel organometallic compound displays high electrophilicity at the antimony center, confirmed by UV-vis spectroscopy and DFT calculations.

Keywords:
FerroceneIntramolecular coordinationKinetic stabilizationPhosphineStibenium

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Spectroscopy

Background:

  • Ferrocene derivatives are widely studied due to their unique electronic and redox properties.
  • Stibenium ions, antimony(V) species, are of interest as electrophilic reagents and Lewis acids.
  • Intramolecular coordination can stabilize reactive species and influence their properties.

Purpose of the Study:

  • To synthesize and characterize a novel bis(ferrocenyl)stibenium complex with intramolecular phosphine coordination.
  • To investigate the electronic properties and electrophilicity of the synthesized stibenium compound.
  • To explore the redox behavior of the new organometallic species.

Main Methods:

  • Synthesis of the bis(ferrocenyl)stibenium via bromide abstraction from a bromostibine precursor.
  • UV-vis spectroscopy to study electronic transitions and charge-transfer phenomena.
  • Density Functional Theory (DFT) calculations to model electronic structure and properties.
  • Cyclic voltammetry to investigate the electrochemical redox behavior.

Main Results:

  • An air-stable bis(ferrocenyl)stibenium compound with intramolecular phosphine coordination was successfully synthesized.
  • UV-vis spectroscopy and DFT calculations indicated ligand-to-metal charge-transfer bands, confirming significant electrophilicity at the antimony center.
  • Cyclic voltammetry revealed irreversible oxidation behavior for the isolated stibenium.

Conclusions:

  • The successful synthesis of this air-stable stibenium demonstrates a viable route to these reactive species.
  • The observed ligand-to-metal charge transfer highlights the potent electrophilic nature of the antimony center.
  • The irreversible oxidation suggests unique redox pathways for this class of organometallic compounds.