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Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
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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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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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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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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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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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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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Copper(i)-NHC complexes as NHC transfer agents.

Fady Nahra1, Alberto Gómez-Herrera2, Catherine S J Cazin3

  • 1Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281 - S3, 9000 Gent, Belgium. Catherine.Cazin@UGent.be.

Dalton Transactions (Cambridge, England : 2003)
|November 25, 2016
PubMed
Summary
This summary is machine-generated.

Copper(I)-N-heterocyclic carbene complexes are advanced transmetallating agents that facilitate N-heterocyclic carbene transfer to various transition metals. Their synthesis as carbene transfer reagents is also detailed.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry

Background:

  • N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
  • Copper complexes are increasingly utilized as catalysts and reagents.

Purpose of the Study:

  • To present recent advances in copper(I)-NHC complexes as transmetallating agents.
  • To discuss the synthesis of these novel carbene transfer reagents.

Main Methods:

  • Utilizing copper(I) complexes for transmetalation.
  • Synthesis and characterization of N-heterocyclic carbene transfer reagents.

Main Results:

  • Demonstrated efficacy of copper(I)-NHC complexes in transferring NHCs.
  • Successful transfer to a diverse array of transition metals.
  • Reported synthetic routes for carbene transfer reagents.

Conclusions:

  • Copper(I)-NHC complexes represent a significant advancement in NHC transfer chemistry.
  • These reagents offer a convenient method for synthesizing transition metal-NHC complexes.