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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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Related Experiment Video

Updated: Dec 5, 2025

Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
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Multicenter electron-sharing σ-bonding in the AgFe(CO)4- complex.

Zhiling Liu1, Yan Bai1, Ya Li1

  • 1School of Chemical and Material Science, Key Laboratory of Magnetic Molecules & Magnetic Information Materials, the Ministry of Education, Shanxi Normal University, No. 1, Gongyuan Street, Linfen, Shanxi 041004, China. lzling@sxnu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|October 21, 2020
PubMed
Summary
This summary is machine-generated.

The novel silver tetracarbonyl-iron anion (AgFe(CO)4-) features a unique covalent bond between silver and iron, extending to adjacent carbon atoms. This electron-sharing bond creates an unusual decentralized bonding situation in the 18-electron complex.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Spectroscopy

Background:

  • Heterodinuclear metal carbonyl anions are crucial in catalysis and materials science.
  • Understanding metal-metal and metal-ligand bonding is key to predicting reactivity.
  • The tetracarbonyl-iron unit is an isolobal analogue of the methyl radical.

Purpose of the Study:

  • To characterize the structure and bonding of the gas-phase silver tetracarbonyl-iron anion (AgFe(CO)4-).
  • To investigate the electronic structure and bonding interactions within this novel complex.
  • To explore the implications of its unique bonding for chemical properties.

Main Methods:

  • Gas-phase generation of the AgFe(CO)4- anion.
  • Photoelectron velocity map imaging spectroscopy for electronic structure determination.
  • State-of-the-art quantum chemical calculations for bonding analysis.

Main Results:

  • The AgFe(CO)4- anion was successfully generated and studied.
  • It is an 18-electron complex with a covalent bond between silver and the tetracarbonyl-iron moiety.
  • Quantum chemical analyses revealed a decentralized bonding situation with silver bonded to iron and vicinal carbon atoms via a sigma bond.

Conclusions:

  • The silver tetracarbonyl-iron anion exhibits a unique, decentralized covalent bonding character.
  • This bonding involves electron sharing between silver, iron, and adjacent carbon atoms.
  • The findings provide new insights into bonding principles in heterodinuclear organometallic complexes.