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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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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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Polyelectrolyte Complexation When Considering the Counterion-Mediated Hydrogen Bonding.

Haiyang Yuan1, Guangming Liu1

  • 1Department of Chemical Physics, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, P. R. China 230026.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 24, 2022
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Summary
This summary is machine-generated.

Counterion-mediated hydrogen bonding (CMHB) is crucial for understanding pH-modulated polyelectrolyte complexation. This effect influences thermodynamics and controls complex formation in solutions and multilayers.

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Area of Science:

  • Polymer Science
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Polyelectrolyte complexation is vital in various applications.
  • Understanding the driving forces behind complexation is essential for material design.
  • Existing models often overlook subtle interactions like hydrogen bonding.

Purpose of the Study:

  • To investigate the role of counterion-mediated hydrogen bonding (CMHB) in pH-modulated polyelectrolyte complexation.
  • To demonstrate how CMHB influences the thermodynamics of polyelectrolyte complex formation.
  • To explore the impact of CMHB on polyelectrolyte complex formation in bulk solutions and on surfaces.

Main Methods:

  • Investigated complexation between oppositely charged strong polyelectrolytes.
  • Analyzed pH-modulated interactions.
  • Examined thermodynamic contributions (enthalpic and entropic) to free energy.
  • Studied polyelectrolyte complex formation in bulk solutions and multilayer formation on surfaces.

Main Results:

  • pH-modulated polyelectrolyte complexation is significantly influenced by CMHB.
  • CMHB alters both enthalpic and entropic contributions to free energy changes.
  • pH-dependent intrinsic ion-pairing and complex coacervation are explained by CMHB.
  • Polyelectrolyte complex formation and multilayer properties are controlled by pH-dependent ion pairing.

Conclusions:

  • CMHB is a critical factor in understanding polyelectrolyte complexation.
  • pH-dependent ion pairing governs complex formation in bulk and on surfaces.
  • This study offers a new strategy for controlling polyelectrolyte complexation using counterions.
  • Findings provide inspiration for developing advanced polyelectrolyte materials.