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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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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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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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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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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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Divalent ligand-monovalent molecule binding.

Mathijs Janssen1,2, Harald Stenmark2, Andreas Carlson1

  • 1Department of Mathematics, Mechanics Division, University of Oslo, N-0851 Oslo, Norway. mathijsj@uio.no.

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|May 7, 2021
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Summary
This summary is machine-generated.

This study details the binding of divalent ligands (AA) to monovalent molecules (B), forming complexes AA·B and AA·B2. It provides a comprehensive analysis for comparable concentrations, crucial for understanding biological interactions.

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Area of Science:

  • Biochemistry
  • Chemical Kinetics
  • Molecular Biology

Background:

  • Simultaneous binding of divalent ligands to monovalent molecules is common in biological and chemical systems.
  • Previous studies focused on extreme concentration ratios ([AA]T >> [B]T or [AA]T << [B]T).
  • A systematic description for comparable concentrations of divalent ligands and monovalent molecules is lacking.

Purpose of the Study:

  • To provide a systematic description of the binding of divalent ligands (AA) to monovalent molecules (B) across the entire range of concentrations.
  • To analyze the formation of intermediate (AA·B) and final (AA·B2) complexes.
  • To investigate the impact of comparable concentrations on binding dynamics.

Main Methods:

  • Numerical and analytical calculations of complex concentrations ([AA·B] and [AA·B2]).
  • Theoretical study of three experimental procedures: dilution, addition of AA, and addition of B.
  • Analysis across the full range of concentration ratios (0 < [B]T/[AA]T < ∞).

Main Results:

  • The study presents results for concentrations of AA·B and AA·B2 for all concentration ratios.
  • Demonstrates that when [AA]T and [B]T are comparable, both free ligand and molecule concentrations decrease upon binding.
  • Highlights the significance of this depletion effect in cellular processes.

Conclusions:

  • This work fills the gap in understanding ligand-molecule binding at comparable concentrations.
  • The observed depletion effect has implications for cellular functions like antigen and coincidence detection.
  • Provides a theoretical framework applicable to various biological and chemical binding phenomena.