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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...
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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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Valence Bond Theory

Overview of Valence Bond Theory
Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
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Formation of Complex Ions03:45

Formation of Complex Ions

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...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Molecule-ion interaction and its effect on coordination interaction.

Le Xin Song1, Shu Zhen Pan, Lin Hong Zhu

  • 1Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China. solexin@ustc.edu.cn

Inorganic Chemistry
|February 10, 2011
PubMed
Summary
This summary is machine-generated.

Ethylenediaminetetraacetic acid disodium salt (Na(2)H(2)EDTA) interacts with β-cyclodextrin (CD), affecting its coordination with copper chloride. This molecule-ion interaction

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Chemical Interactions

Background:

  • Ethylenediaminetetraacetic acid disodium salt (Na(2)H(2)EDTA) is a chelating agent.
  • Beta-cyclodextrin (CD) is a cyclic oligosaccharide known for its host-guest complexation abilities.
  • Understanding interactions in multicomponent systems is crucial for various chemical applications.

Purpose of the Study:

  • To investigate the molecule-ion interaction between Na(2)H(2)EDTA and β-CD.
  • To determine how this interaction influences the coordination of Na(2)H(2)EDTA with copper chloride.
  • To elucidate the underlying mechanisms of these competitive interactions.

Main Methods:

  • Crystal pattern analysis and thermal behavior studies.
  • Electric conductivity measurements to quantify interaction extent.
  • UV-vis spectroscopy and nuclear magnetic resonance (NMR) spectroscopy to analyze interactions and binding modes.

Main Results:

  • Observable changes in crystal patterns and thermal properties indicate Na(2)H(2)EDTA and β-CD interaction.
  • Electric conductivity confirms molecule-ion interaction, dependent on β-CD concentration.
  • Interaction decreases Na(2)H(2)EDTA's coordination with copper chloride in a β-CD concentration-dependent manner.
  • NMR studies reveal distinct interaction modes of β-CD with H(2)EDTA(2-) and [Cu(EDTA)](2-).

Conclusions:

  • A competitive relationship exists between molecule-ion interaction and coordination interaction.
  • The findings bridge coordination chemistry and supramolecular chemistry.
  • Results enhance understanding of factors governing interactions in complex chemical systems.