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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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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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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.0K
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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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

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Functionalization of Pentaphosphorus Cations by Complexation.

Anup K Adhikari1, Christoph G P Ziegler1, Kai Schwedtmann2

  • 1Institute of Inorganic Chemistry, University of Regensburg, 93040, Regensburg, Germany.

Angewandte Chemie (International Ed. in English)
|September 28, 2019
PubMed
Summary
This summary is machine-generated.

This study explores the coordination chemistry of polyphosphorus cations with metal complexes, yielding novel bicyclo[1.1.0]pentaphosphanes and functionalized cationic complexes. These findings expand the understanding of phosphorus cluster reactivity and coordination behavior.

Keywords:
P ligandscobaltcoordination compoundsnickelphosphorus

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Recent advancements in polyphosphorus cation chemistry.
  • Limited exploration of polyphosphorus cation coordination behavior.

Purpose of the Study:

  • To investigate the reactivity of [P5R2]+ cations with cyclopentadienyl metal complexes.
  • To synthesize and characterize novel polyphosphorus-metal coordination compounds.

Main Methods:

  • Reaction of [CpArFe(μ-Br)]2 with [P5R2][GaCl4].
  • Synthesis of cationic cobalt and nickel complexes with P5R2 ligands.
  • Anion metathesis and subsequent functionalization of the P5 framework.

Main Results:

  • Formation of bicyclo[1.1.0]pentaphosphanes with unsymmetric "butterfly" structures.
  • Synthesis of cationic [CpArCo(η4-P5R2)]+ and [(CpArNi)2(η3:3-P5R2)]+ complexes.
  • Successful anion metathesis and subsequent cyano-, chloro-, and organo-functionalization of the P5 framework.

Conclusions:

  • Demonstrated novel reactivity of polyphosphorus cations in coordination chemistry.
  • Established synthetic routes to unique phosphorus-metal complexes.
  • Opened avenues for further functionalization and application of polyphosphorus frameworks.