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Related Concept Videos

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...
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...
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...
Coordination Number and Geometry02:57

Coordination Number and Geometry

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.
Valence Bond Theory02:42

Valence Bond Theory

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...
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...

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
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Published on: December 29, 2016

Homoleptic pnictogen-chalcogen coordination complexes.

Jonathan W Dube1, Mikko M Hänninen, Jason L Dutton

  • 1Department of Chemistry and The Center for Advanced Materials and Biomaterials Research, Western University, 1151 Richmond Street, London, Ontario, Canada N6A 5B7.

Inorganic Chemistry
|July 31, 2012
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel dicationic selenium and tellurium compounds, forming rare homoleptic coordination complexes. These studies reveal the first arsenic-to-chalcogen dative bond, expanding coordination chemistry knowledge.

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Area of Science:

  • Inorganic Chemistry
  • Coordination Chemistry
  • Organometallic Chemistry

Background:

  • Carbodiphosphorane and triphosphenium compounds are important in coordination chemistry.
  • Homoleptic pnictogen coordination complexes are rare and structurally intriguing.
  • Understanding dative bonding in heavier pnictogens is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and structurally characterize novel dicationic selenium and tellurium complexes.
  • To investigate the formation of homoleptic pnictogen → chalcogen coordination bonds.
  • To explore the electronic structures and bonding in these unique dicationic systems.

Main Methods:

  • Ligand-exchange reactions using [Ch](2+) reagents (Ch = Se, Te).
  • Synthesis of dicationic complexes with 1,2-bis(diphenylphosphino)ethane (dppe) and 1,2-bis(diphenylarsino)ethane (dpAse) ligands.
  • Structural characterization and electronic structure determination of the synthesized compounds.

Main Results:

  • Successful synthesis of dicationic selenium and tellurium complexes, [Ch(dppe)][OTf](2) and [Ch(dpAse)][OTf](2).
  • These represent rare homoleptic pnictogen → chalcogen coordination complexes.
  • The arsenic-containing complexes demonstrate the first instance of an arsenic → chalcogen dative bond.

Conclusions:

  • The study reports novel dicationic pnictogen-chalcogen complexes with unique bonding.
  • The findings expand the known examples of homoleptic coordination compounds.
  • The electronic structures provide insights into bonding in these rare dicationic systems.