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Related Concept Videos

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...
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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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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.
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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.
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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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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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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
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Complementary dynamic assembly around an iron(III) cation.

Galina Melman1, Pavan Vimal, Artem Melman

  • 1Department of Chemistry & Biomolecular Science, Clarkson University, Potsdam, New York 13699, USA.

Inorganic Chemistry
|August 27, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel system for coordinating terdentate ligands around a ferric cation. This system demonstrates highly selective switching between different ligand complex types.

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Published on: September 7, 2019

Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Inorganic Chemistry

Background:

  • Terdentate ligands play a crucial role in stabilizing metal ions.
  • The 2-(hydroxyamino)-1,3,5-triazine motif offers unique coordination properties.
  • Controlling ligand exchange and complex formation is essential for developing functional materials.

Purpose of the Study:

  • To report a new system for the complementary coordination of two different terdentate ligands.
  • To investigate the behavior of a ferric cation complexed with a 2-(hydroxyamino)-1,3,5-triazine motif.
  • To explore the selectivity of prototropic switching between heteroligand and homoligand complexes.

Main Methods:

  • Synthesis of ferric cation complexes with 2-(hydroxyamino)-1,3,5-triazine terdentate ligands.
  • Spectroscopic and crystallographic analyses to characterize the coordination complexes.
  • Investigation of prototropic switching mechanisms and selectivity under varying conditions.

Main Results:

  • A novel coordination system utilizing a 2-(hydroxyamino)-1,3,5-triazine motif around a ferric cation was successfully developed.
  • Prototropic switching between heteroligand and homoligand complexes was observed.
  • The switching process exhibited high selectivity, exceeding 95% for one complex type over the other.

Conclusions:

  • The reported system enables precise control over ligand coordination around a ferric ion.
  • The high selectivity of prototropic switching offers potential for developing switchable molecular systems.
  • This work contributes to the understanding of ligand design and metal-ligand interactions in coordination chemistry.