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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

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 be...
Stereoisomerism02:52

Stereoisomerism

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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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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Linkage isomerism in coordination polymers.

Samia Benmansour1, Fatima Setifi, Smail Triki

  • 1Instituto de Ciencia Molecular (ICMol), Parque Científico, Universidad de Valencia, C/Catedrático José Beltrán, 2, 46980 Paterna, Valencia, Spain. sam.ben@uv.es

Inorganic Chemistry
|February 3, 2012
PubMed
Summary
This summary is machine-generated.

This study reveals a rare instance of linkage isomerism in coordination chains using a novel polynitrile ligand with iron, cobalt, and nickel. The isomers exhibit similar magnetic properties, highlighting the ligand

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Polynitrile ligands are crucial in constructing coordination polymers and chains.
  • Linkage isomerism, where a ligand binds to a metal center through different atoms, is uncommon in coordination chains.
  • Understanding ligand connectivity is key to controlling the properties of metal-organic frameworks.

Purpose of the Study:

  • To synthesize and characterize coordination chains using the novel polynitrile ligand tcnopr3OH(-).
  • To investigate the occurrence of linkage isomerism in these coordination chains.
  • To explore the magnetic properties of the resulting linkage isomers.

Main Methods:

  • Synthesis of metal complexes with iron(II), cobalt(II), and nickel(II) salts and the tcnopr3OH(-) ligand.
  • Structural characterization of the coordination chains using X-ray diffraction and other spectroscopic techniques.
  • Magnetic susceptibility measurements to determine magnetic behaviors.

Main Results:

  • Successful synthesis of three pairs of linkage isomers: [M(tcnopr3OH-κN,κO)(2)(H(2)O)(2)] and [M(tcnopr3OH-κN,κN')(2)(H(2)O)(2)] for M = Fe, Co, Ni.
  • Isomers differ in the binding mode of the polynitrile ligand (N,O- vs. N,N'-).
  • Both linkage isomers within each pair exhibit very similar magnetic properties.

Conclusions:

  • The polynitrile ligand tcnopr3OH(-) can form coordination chains exhibiting linkage isomerism.
  • Linkage isomerism in these systems does not significantly alter the observed magnetic behavior.
  • This work provides a rare example of linkage isomerism in coordination chains, expanding knowledge of coordination chemistry.