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Related Concept Videos

Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

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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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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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Compartment Models: Single-Compartment Model01:14

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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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Mechanistic Models: Overview of Compartment Models01:21

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Mechanistic models, a category encompassing both physiological and compartmental modeling, differ from empirical models' approaches to incorporating known factors about the systems being modeled. Empirical models describe data with minimal assumptions, while mechanistic models aim to provide a robust description of available data by specifying assumptions and integrating known factors about the system. Compartmental analysis is a key example of a mechanistic model in pharmacokinetics and...
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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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A simple simulation model for complex coacervates.

Sai Vineeth Bobbili1, Scott T Milner1

  • 1Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania, USA. stm9@psu.edu.

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|September 29, 2021
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Summary
This summary is machine-generated.

This study introduces a simplified model for coacervate phase behavior. The findings reveal a "Bjerrum liquid" state at the phase boundary, offering insights into polyelectrolyte solutions.

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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Soft Matter Physics

Background:

  • Associative phase separation of oppositely charged polyelectrolytes forms coacervates in aqueous solutions.
  • Experimental studies characterize coacervate phase diagrams, influenced by charge density, chain length, and salt concentration.
  • Simulations, often employing hybrid Monte Carlo-Molecular Dynamics (MC-MD) methods, support experimental findings.

Purpose of the Study:

  • To propose an idealized model and simulation technique for investigating coacervate phase behavior.
  • To understand the fundamental principles governing coacervate formation and stability.
  • To provide a simplified approach for predicting coacervate phase diagrams.

Main Methods:

  • Modeling coacervate systems using charged bead-spring chains and counterions with short-range repulsions.
  • Employing a simulation technique that equilibrates a concentrated coacervate slab with a dilute counterion phase.
  • Determining phase behavior by analyzing the swelling equilibrium.

Main Results:

  • Identification of a

Conclusions:

  • The proposed model and simulation technique offer a simplified yet effective method for studying coacervate phase behavior.
  • The concept of a