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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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 the dxy,...
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Crystal Field Theory - Octahedral Complexes02:58

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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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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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A Linear Two-Coordinate Cr(II) Complex: Synthesis, Characterization, and Reactivity.

Kai-Chin Hsiao1, Po-Chun Yang1, Chia-Te Fang1

  • 1Department of Chemistry, National Cheng Kung University, No. 1 University Road, 701401, Tainan, Taiwan.

Chemistry, an Asian Journal
|December 7, 2023
PubMed
Summary
This summary is machine-generated.

This study reports the synthesis of a linear two-coordinate chromium(II) amido complex. Oxidation reactions were explored, yielding various chromium(III), (IV), and (VI) complexes, alongside DFT calculations.

Keywords:
Amido ligandsChromiumLow-valent compoundsReactivityTwo-coordinate

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Coordination Chemistry

Background:

  • Linear, two-coordinate metal complexes are rare and intriguing due to their unique electronic properties.
  • Chromium amido complexes are valuable precursors for various chemical transformations.
  • Understanding the reactivity of low-coordinate chromium complexes is crucial for developing new catalytic systems.

Purpose of the Study:

  • To synthesize and characterize a novel linear two-coordinate chromium(II) amido complex.
  • To investigate the oxidation reactions of this complex with various oxidants and substrates.
  • To elucidate the electronic structure of the resulting complexes using computational methods.

Main Methods:

  • Synthesis of the chromium(II) amido complex via reaction of CrCl2 and LiN(tBu)Dipp.
  • Single-crystal X-ray diffractometry (SC-XRD) for structural determination.
  • Oxidation reactions with AgOTf, [FeCp2][BArF4], organic azides, Me3NO, and carbodiimides.
  • Density Functional Theory (DFT) calculations for electronic structure analysis.

Main Results:

  • Successful synthesis and characterization of the linear two-coordinate Cr(II) amido complex, Cr{N(tBu)Dipp}2, featuring a short Cr-N bond.
  • Formation of trigonal planar and bent Cr(III) complexes upon oxidation with AgOTf and [FeCp2][BArF4].
  • Synthesis of three-coordinate Cr(IV) imido complexes with organic azides and a Cr(VI) dioxo complex with Me3NO.
  • Carbodiimide insertion into the Cr-N bond yielding a three-coordinate Cr(II) complex.
  • DFT calculations provided insights into the electronic structures of the synthesized complexes.

Conclusions:

  • The synthesized linear two-coordinate Cr(II) amido complex is a versatile precursor for accessing higher oxidation state chromium complexes.
  • The reactivity profile demonstrates the ability of the amido ligand to stabilize various oxidation states of chromium.
  • This work expands the scope of low-coordinate chromium chemistry and provides a foundation for future catalytic applications.