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Related Concept Videos

Complexation Equilibria: The Chelate Effect01:19

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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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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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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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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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Complexation Equilibria: Overview01:23

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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.
The equilibrium constant of the complexation reaction is represented as the formation constant...
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EDTA: Chemistry and Properties01:22

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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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Formation of Complex Ions03:45

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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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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Complexation Behavior of Polyelectrolytes and Polyampholytes.

Arun Kumar Narayanan Nair1, Arturo Martinez Jimenez1, Shuyu Sun1

  • 1Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.

The Journal of Physical Chemistry. B
|July 26, 2017
PubMed
Summary
This summary is machine-generated.

Grand canonical Monte Carlo simulations reveal that electrostatic interactions in polyampholytes drive charge coexistence and polymer stretching. Salt ions screen these charges, reducing chain size and altering titration curves.

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Area of Science:

  • Polymer Physics
  • Computational Chemistry
  • Physical Chemistry

Background:

  • Polyampholytes exhibit complex behavior due to intra-chain charge interactions.
  • Understanding pH titration is crucial for predicting polyampholyte behavior in solution.
  • Polyelectrolyte-polyampholyte complexes have potential applications in materials science.

Purpose of the Study:

  • To investigate the pH titration of isolated polyampholytes and polyelectrolyte-polyampholyte complexes.
  • To elucidate the role of electrostatic interactions and salt concentration on polyampholyte conformation and titration.
  • To analyze the stability and structural properties of polyelectrolyte-polyampholyte complexes.

Main Methods:

  • Grand canonical Monte Carlo simulations were employed.
  • Simulations were performed for isolated polyampholytes and polyelectrolyte-polyampholyte complexes.
  • Dilute solutions with varying salt concentrations were studied.

Main Results:

  • Electrostatic interactions promote coexistence of opposite charges along polyampholyte chains, leading to stretching.
  • Salt ions screen charge repulsion and attraction, reducing the deviation of titration curves from ideal behavior and decreasing chain size.
  • Polyelectrolyte-polyampholyte complexes are stable at low pH; complex formation at high pH is linked to salt content. Adsorbed polyampholytes show reduced charge coexistence.
  • Polyampholyte chains in complexes typically reside at the polyelectrolyte chain ends.

Conclusions:

  • Electrostatic interactions significantly influence polyampholyte behavior, including charge distribution and chain conformation.
  • Salt concentration plays a critical role in modulating these electrostatic effects.
  • The study provides insights into the formation and stability of polyelectrolyte-polyampholyte complexes.