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Related Concept Videos

Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.8K
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...
2.8K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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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Intermolecular Forces03:13

Intermolecular Forces

66.9K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
66.9K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.0K
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...
2.0K

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Related Experiment Video

Updated: Dec 1, 2025

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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The Thiouronium Group for Ultrastrong Pairing Interactions between Polyelectrolytes.

Sandrine Lteif1, Samir Abou Shaheen1, Joseph B Schlenoff1

  • 1Department of Chemistry and Biochemistry, The Florida State University, Tallahassee, Florida 32306, United States.

The Journal of Physical Chemistry. B
|November 11, 2020
PubMed
Summary

Polythiouroniums exhibit strong interactions with polyanions, forming stable polyelectrolyte complexes (PECs). These complexes show resilience to salt concentrations, demonstrating the thiouronium group

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Last Updated: Dec 1, 2025

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Supramolecular Chemistry

Background:

  • Polyelectrolytes are polymers with charged repeat units that interact to form polyelectrolyte complexes (PECs) or coacervates.
  • The strength of these interactions, crucial for PEC formation and properties, depends on the specific chemical identity of the charged groups.
  • Guanidinium-containing polymers, like polyarginine, are known for unique behaviors including like-charge ion pairing and hydrogen bonding.

Purpose of the Study:

  • To evaluate the pairing strength of the thiouronium group, a cation structurally similar to guanidinium, within a polythiouronium polyelectrolyte.
  • To investigate the resulting interactions between polythiouroniums and various polyanions, including polysulfonates, polycarboxylates, and polymeric zwitterions.
  • To assess the stability and resilience of the formed polyelectrolyte complexes under varying conditions, such as salt concentration.

Main Methods:

  • Synthesis of a polythiouronium polyelectrolyte for experimental evaluation.
  • Formation and characterization of polyelectrolyte complexes (PECs) between polythiouronium and different polyanions.
  • Assessment of PEC stability through the buildup of polyelectrolyte multilayers at varying salt concentrations.
  • Investigation of PEC dissociation under high salt concentrations to determine interaction resilience.

Main Results:

  • Polythiouroniums demonstrate exceptionally strong interactions with polyanions like polysulfonates and polycarboxylates, surpassing expectations.
  • This strong interaction behavior, including aspects of like-charge pairing and hydrogen bonding, is inherited from guanidinium-related structures.
  • The polythiouronium/polyanion complexes exhibit remarkable resilience, maintaining integrity even at elevated salt concentrations.
  • Complexation is also achieved with polymeric zwitterions, indicating strong interactions even with nominally neutral polymers.

Conclusions:

  • The thiouronium group is a highly effective cation for forming robust polyelectrolyte complexes with strong polyanions.
  • Polythiouroniums offer a promising platform for developing stable materials through polyelectrolyte complexation, with tunable properties.
  • The findings expand the understanding of charge-driven polymer interactions and the design principles for advanced polyelectrolyte materials.