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Stereoisomerism02:52

Stereoisomerism

13.9K
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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Valence Bond Theory02:42

Valence Bond Theory

11.2K
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...
11.2K
Structural Isomerism02:34

Structural Isomerism

21.5K
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...
21.5K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.2K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
4.2K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.6K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.6K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

10.9K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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A Modular Approach to Asymmetric Mg(I) Complexes Using a Unique Cyclopentadienyl Mg(I) Complex.

Hannah Stecher1, Stefan Thum1, Johannes Maurer1

  • 1Inorganic and Organometallic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany.

Angewandte Chemie (International Ed. in English)
|October 17, 2025
PubMed
Summary
This summary is machine-generated.

Researchers report the first magnesium(I) complexes featuring non-nitrogen ligands, including a unique Mg-Mg bonded species. This breakthrough expands the chemistry of low-valent magnesium compounds and offers new avenues for synthesis.

Keywords:
CalciumDFTLigand exchangeLow‐valentMagnesium

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Low-Valent Main Group Elements

Background:

  • The chemistry of low-valent main group elements, particularly magnesium, remains underexplored.
  • Stabilizing low oxidation states often requires bulky ligands and specific reaction conditions.

Purpose of the Study:

  • To synthesize and characterize novel magnesium(I) complexes with non-nitrogen ligands.
  • To investigate the reactivity and ligand exchange capabilities of these new complexes.
  • To explore the formation of magnesium-magnesium bonds.

Main Methods:

  • Reaction of pre-formed magnesium-sodium complexes with magnesium or calcium pentamethylcyclopentadienyl (Cp*) compounds.
  • Ligand exchange reactions with alkali metal complexes.
  • Characterization using X-ray diffraction and NMR spectroscopy.
  • Computational studies on thermodynamics and electronic structure.

Main Results:

  • Isolation and full characterization of the first Mg(I) complexes with non-N ligands, including (BDI*)MgMgCp*.
  • Demonstration of ligand exchange at the Mg-Mg bond, forming (BDI*)MgMgL.
  • Synthesis of a Mg(I) complex stabilized by an aryloxide ligand, (BDI*)MgMgOAr·THF.
  • Observation of Mg insertion into a C-H bond in reactions with CaCp*2.

Conclusions:

  • The study successfully established new synthetic routes to low-valent magnesium complexes.
  • The findings highlight the versatility of the BDI* ligand in stabilizing unusual magnesium species.
  • This work opens new possibilities for exploring the fundamental chemistry and potential applications of Mg(I) compounds.