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Related Concept Videos

Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Diazonium Group Substitution: –OH and –H01:19

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Structure of Amines01:19

Structure of Amines

3.4K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are...
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Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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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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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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A1/A2-Diamino-Substituted Pillar[5]arene-Based Acid-Base-Responsive Host-Guest System.

Wei-Bo Hu1, Wen-Jing Hu1, Xiao-Li Zhao2

  • 1Shanghai Advanced Research Institute, Chinese Academy of Science , Shanghai 201210, China.

The Journal of Organic Chemistry
|April 19, 2016
PubMed
Summary

A novel supramolecular system uses a chiral pillararene host to capture and release imidazolium guests in response to acid-base changes. This responsive host-guest chemistry enables controlled ion recognition.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Supramolecular host-guest systems are crucial for molecular recognition and sensing.
  • Developing responsive systems that change behavior based on external stimuli like pH is a key challenge.
  • Pillararenes are macrocyclic hosts with tunable cavities suitable for guest encapsulation.

Purpose of the Study:

  • To create an acid-base-responsive supramolecular host-guest system.
  • To utilize a planarly chiral diamino-substituted pillararene for selective ion recognition.
  • To demonstrate controlled guest release based on pH changes.

Main Methods:

  • Synthesis of a planarly chiral diamino-substituted pillar[5]arene (1).
  • Investigation of host-guest complexation with imidazolium cations.
  • Evaluation of the system's responsiveness to varying pH conditions (acidic, neutral, basic).

Main Results:

  • The pillararene host (1) successfully forms a host-guest complex with imidazolium cations under neutral/basic conditions.
  • The complex dissociates, releasing the imidazolium cation under acidic conditions.
  • The system exhibits clear acid-base responsiveness, demonstrating controlled guest binding and release.

Conclusions:

  • A novel acid-base-responsive supramolecular system was successfully developed.
  • The chiral pillararene host provides a platform for pH-controlled imidazolium ion recognition.
  • This work opens avenues for designing smart materials for sensing and separation applications.