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Related Concept Videos

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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The one-compartment model is a pharmacokinetic tool that models the body as a single, uniform compartment, facilitating the understanding of drug distribution and elimination. This model is particularly beneficial for intravenous (IV) bolus administration, where the drug rapidly circulates throughout the body.
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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.
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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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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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The single-compartment model serves as a simplified representation of the human body. This model assumes that the body functions as a single, well-mixed open compartment. When a drug is administered intravenously, it enters the body and quickly distributes uniformly. The drug then undergoes biotransformation and elimination, ultimately leaving the body. The volume of this compartment is referred to as the apparent volume of distribution into which the drug can uniformly distribute. In this...
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Updated: Nov 21, 2025

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Practical considerations for generation of multi-compartment complex coacervates.

Gregory A Mountain1, Christine D Keating1

  • 1Department of Chemistry, Pennsylvania State University, University Park, PA, United States.

Methods in Enzymology
|January 17, 2021
PubMed
Summary
This summary is machine-generated.

Researchers created multi-compartment membraneless organelles using complex coacervation. These experimental models maintain distinct compositions indefinitely, offering insights into cellular organization and artificial cell design.

Keywords:
Artificial cellCompartmentalizationIntracellular condensateLiquid-liquid phase separationPartitioning

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Cell Biology

Background:

  • Membraneless organelles are crucial for cellular function, organizing biomolecules within distinct compartments.
  • Understanding their formation and stability is key to deciphering cellular processes and engineering artificial cells.

Purpose of the Study:

  • To present a framework for creating experimental models of multi-compartment membraneless organelles.
  • To detail the application of complex coacervation for generating these structures.
  • To provide practical guidance for the design, generation, and analysis of these coacervate systems.

Main Methods:

  • Utilizing complex coacervation, a phenomenon driven by electrostatic interactions between oppositely charged polyelectrolytes.
  • Demonstrating the phase separation of macromolecule-rich liquid phases, including proteins and nucleic acids.
  • Developing protocols for the construction and characterization of multi-compartment coacervates.

Main Results:

  • Successfully prepared stable, multi-compartment membraneless organelle models.
  • Showcased the ability of complex coacervation to drive the formation of distinct, coexisting phases.
  • Provided a comprehensive guide with practical considerations for researchers.

Conclusions:

  • Complex coacervation offers a versatile platform for building biomimetic multi-compartment systems.
  • These model systems are valuable for studying intracellular organization and for the development of artificial cells.
  • The presented methods facilitate the exploration of phase separation in biological and synthetic contexts.