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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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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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Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

2.6K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
2.6K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

10.4K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
10.4K
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

4.2K
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Iridium(I)- and Rhodium(I)-Olefin Complexes Containing an α-Diimine Supporting Ligand.

James Kovach1, Suzanne R Golisz1, William W Brennessel1

  • 1Department of Chemistry, University of Rochester, Rochester, New York 14627, United States.

Organometallics
|December 5, 2022
PubMed
Summary
This summary is machine-generated.

New iridium(I) and rhodium complexes featuring an α-diimine ligand were synthesized. These novel organometallic compounds exhibit unique spectroscopic properties and were structurally characterized, offering insights into their coordination chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Spectroscopy

Background:

  • Iridium(I) and rhodium complexes are crucial in catalysis and materials science.
  • α-diimine ligands offer tunable electronic and steric properties for metal complexes.
  • Understanding the structure-property relationships of these complexes is vital for developing new applications.

Purpose of the Study:

  • Synthesize and characterize novel iridium(I) complexes with α-diimine ligands.
  • Investigate the spectroscopic properties (NMR, UV-vis) of these iridium complexes.
  • Explore the structural and electronic characteristics of related rhodium complexes.

Main Methods:

  • Synthesis of iridium(I) complexes from [IrCl(COE)2]2 precursor.
  • Spectroscopic characterization using 1H NMR, NOESY, and HSQC NMR.
  • Structural elucidation via X-ray crystallography for key iridium and rhodium complexes.
  • Investigation of rhodium complex equilibrium under ethylene atmosphere.

Main Results:

  • Successful synthesis of iridium(I) complexes IrX(olefin)(α-diimine) with various substituents (X, olefin).
  • Observed unusual 1H NMR spectra and high UV-vis extinction coefficients for the iridium complexes.
  • Rigorous NMR assignments confirmed by NOESY and HSQC experiments.
  • X-ray crystallography provided detailed structures for IrCl(C2H4)(α-diimine) and IrCl(COE)(α-diimine).
  • Synthesis and characterization of the rhodium dimer [RhCl(α-diimine)]2 and its equilibrium with the monomeric ethylene complex.

Conclusions:

  • The synthesized iridium(I) and rhodium complexes represent new additions to organometallic chemistry.
  • The complexes exhibit distinct spectroscopic and structural features.
  • The study provides a foundation for further investigations into the reactivity and applications of these metal complexes.