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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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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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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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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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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...
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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Approaching monocoordination at a silver(i) cation.

Matthew M D Roy1, Michael J Ferguson, Robert McDonald

  • 1Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta T6G 2G2, Canada. erivard@ualberta.ca.

Chemical Communications (Cambridge, England)
|December 21, 2017
PubMed
Summary
This summary is machine-generated.

A bulky N-heterocyclic carbene, ITr, stabilizes low-coordinate silver(I) complexes. These electrophilic silver species exhibit high methyl ion affinity, showcasing unique P-C π bond interactions.

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Area of Science:

  • Organometallic chemistry
  • Coordination chemistry
  • Main group chemistry

Background:

  • N-heterocyclic carbenes (NHCs) are versatile ligands in coordination chemistry.
  • Stabilization of low-coordinate metal centers remains a significant challenge.
  • Silver(I) complexes with NHCs are of interest due to their electronic properties.

Purpose of the Study:

  • To investigate the coordination behavior of a bulky N-heterocyclic carbene (ITr) with silver(I).
  • To characterize the resulting low-coordinate silver(I) species.
  • To evaluate the electrophilicity and electronic properties of these novel complexes.

Main Methods:

  • Crystallographic analysis of silver(I) complexes.
  • Spectroscopic characterization.
  • Computational studies including methyl ion affinity (MIA) calculations.

Main Results:

  • The bulky N-heterocyclic carbene ITr successfully stabilized low-coordinate Ag(I) environments.
  • Crystallographic identification of weak solvates [(ITr)Ag(sol)]+ and a solvent-free dimer [(ITr)Ag]22+.
  • Demonstration of high electrophilicity of the [(ITr)Ag]+ cation via high MIA and synthesis of [(ITr)Ag(PCO)] complex.

Conclusions:

  • The bulky ITr ligand is effective in stabilizing unusual low-coordinate Ag(I) species.
  • These complexes exhibit significant electrophilic character.
  • The study highlights novel bonding interactions, including side-on donation from a P-C π bond.