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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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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...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
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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...
8.9K
Structural Isomerism02:34

Structural Isomerism

16.8K
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,...
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Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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Related Experiment Video

Updated: Apr 28, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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First oxido-bridged cubo-octahedral hexanuclear rhenium clusters.

Marta S Krawczyk1, Monika K Krawczyk, Miłosz Siczek

  • 1Faculty of Chemistry, University of Wrocław , F. Joliot-Curie 14 Street, 50-383 Wrocław, Poland.

Inorganic Chemistry
|June 14, 2014
PubMed
Summary

Researchers synthesized novel hexanuclear rhenium clusters with a unique cube-like Re6(μ-O)12 core. These rhenium metal clusters exhibit stable redox properties, paving the way for new polynuclear complex synthesis.

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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Polynuclear metal clusters are crucial in catalysis and materials science.
  • Rhenium clusters offer unique electronic and structural properties.
  • Previous syntheses often required harsh conditions, limiting accessibility.

Purpose of the Study:

  • To synthesize novel hexanuclear rhenium clusters with a specific topology.
  • To investigate the redox behavior of the newly synthesized rhenium clusters.
  • To establish a mild and efficient synthetic route for polynuclear rhenium complexes.

Main Methods:

  • A simple one-pot reaction was employed for cluster synthesis.
  • Characterization of the rhenium clusters using spectroscopic and crystallographic techniques.
  • Electrochemical methods were used to study redox properties.

Main Results:

  • Successfully synthesized the first discrete hexanuclear metal clusters with M6(μ-O)12 cubo-octahedral topology.
  • Developed a new class of rhenium clusters: hexanuclear rhenium complexes with 12 bridging oxygen ligands.
  • The [Re6(μ-O)12(3-Mepy)6]BPh4 cluster demonstrated reversible redox reactions without structural changes.
  • A quantitative reduction reaction yielded the molecular [Re6(μ-O)12(3-Mepy)6] complex.

Conclusions:

  • A novel synthetic strategy provides access to polynuclear rhenium complexes under mild conditions.
  • The synthesized rhenium clusters exhibit robust redox activity, indicating potential applications.
  • This work expands the library of rhenium cluster compounds and their synthetic methodologies.