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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.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Valence Bond Theory02:42

Valence Bond Theory

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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.9K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.9K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.7K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.7K
Colors and Magnetism03:02

Colors and Magnetism

14.7K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Tuneable electronic coupling in linked bis(cubane) cobalt-oxo clusters.

Vincent J P Maddi1,2, T Don Tilley1,2

  • 1Department of Chemistry, University of California Berkeley California 94720 USA tdtilley@berkeley.edu.

Chemical Science
|April 6, 2026
PubMed
Summary
This summary is machine-generated.

New cobalt-oxo bis(cubane) complexes were synthesized using bridging ligands. Pyrazine-bridged complexes show tunable electronic coupling between cobalt-oxo cubane units, impacting water oxidation catalysis.

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Area of Science:

  • Inorganic Chemistry
  • Catalysis
  • Electrochemistry

Background:

  • Cobalt-oxo cubanes are known catalysts for water oxidation.
  • Bridging ligands are crucial for creating multi-nuclear complexes with potential catalytic applications.

Purpose of the Study:

  • To synthesize and characterize a family of cobalt-oxo bis(cubane) complexes.
  • To investigate the electronic coupling between cobalt-oxo cubane subunits.
  • To evaluate the influence of bridging ligands on catalytic properties and electrochemical behavior.

Main Methods:

  • Synthesis of cobalt-oxo bis(cubane) complexes utilizing 4,4'-bipyridine and pyrazine as bridging ligands.
  • Electrochemical analysis, specifically half-wave potential measurements, to assess electronic communication.
  • Ligand substitution to tune the electronic properties of the complexes.

Main Results:

  • Successful synthesis of cobalt-oxo bis(cubane) complexes with both 4,4'-bipyridine and pyrazine linkers.
  • Pyrazine-bridged complexes demonstrated significant inter-cubane electronic coupling.
  • Electronic coupling was found to be tunable via ligand substitution.
  • Electrostatic contributions and ion-pairing effects influenced the observed electrochemical potentials.

Conclusions:

  • Cobalt-oxo bis(cubane) complexes can be effectively constructed using various bridging ligands.
  • The pyrazine linker facilitates electronic communication between catalytic cobalt-oxo cubane units.
  • Electrolyte ion-pairing significantly impacts the electrochemical behavior, leading to non-conformist observations.