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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

24.9K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
24.9K
Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

35.3K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
35.3K
Solution Composition During Acid/Base Titrations01:17

Solution Composition During Acid/Base Titrations

1.5K
The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values...
1.5K
Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

9.4K
This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
9.4K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

3.1K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
3.1K
Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

47.2K
The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution.  In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
47.2K

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Author Spotlight: Utilizing Next-Generation Polymerized Human Hemoglobin for Improved Donor Lung Evaluation and Preservation in Rats
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Calixarene-based supramolecular polymerization in solution.

Dong-Sheng Guo1, Yu Liu

  • 1Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, PR China.

Chemical Society Reviews
|May 24, 2012
PubMed
Summary
This summary is machine-generated.

This review explores calixarene-based supramolecular polymers, highlighting their fabrication and diverse applications. These advanced materials offer potential for smart, self-healing, and drug delivery systems.

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science

Background:

  • Calixarenes are cyclic oligomers derived from phenol-formaldehyde.
  • They possess unique structural scaffolds, facile modification, and adjustable inclusion properties.

Purpose of the Study:

  • To review the fabrication of calixarene-based supramolecular polymers.
  • To illustrate different types and applications of these polymers.

Main Methods:

  • Categorization of polymers based on calixarene activity: polycaps, polymeric scaffolds, and host-guest interactions.
  • Discussion of stimuli-responsiveness and functional properties.

Main Results:

  • Three distinct types of calixarene-based supramolecular polymers are presented.
  • Demonstration of stimuli-responsive behavior and functional capabilities.

Conclusions:

  • Calixarene-based supramolecular polymers show significant potential for advanced applications.
  • These include smart materials, self-healing systems, and drug delivery carriers.