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Related Concept Videos

Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

6.2K
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).
6.2K
Physical Properties of Amines01:26

Physical Properties of Amines

3.4K
Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
3.4K
Basicity of Aliphatic Amines01:21

Basicity of Aliphatic Amines

6.1K
Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates...
6.1K
NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

9.3K
In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
9.3K
Structure of Amines01:19

Structure of Amines

2.7K
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’...
2.7K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

773
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
773

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Detection of Detergent-sensitive Interactions Between Membrane Proteins
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Hydrogen-bonding and "π-π" interaction promoted solution-processable mixed matrix membranes for aromatic amines

Lei Zhang1, Shuang-Long Wang2, Yunshu Tan1

  • 1School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China.

Journal of Hazardous Materials
|June 24, 2022
PubMed
Summary

We developed a new easy-to-use detector for carcinogenic aromatic amines using conjugated molecules in mixed matrix membranes (MMMs). This portable device offers on-site detection with a clear fluorescence signal, enhancing human health protection.

Keywords:
Aniline detectionConjugated compoundsDevice fabricationIonic liquidsPortable device

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Chemical Engineering

Background:

  • Detecting hazardous compounds like carcinogenic aromatic amines is crucial for public health.
  • Existing testing tools are often not user-friendly or suitable for on-site applications.

Purpose of the Study:

  • To develop a novel, easy-to-use testing tool for detecting carcinogenic aromatic amines.
  • To create portable mixed matrix membranes (MMMs) with a visual output for hazardous compound detection.

Main Methods:

  • Fabrication of pentacene-based mixed matrix membranes (MMMs) using ionic liquids (ILs) as the continuous phase via a solution-processable strategy.
  • Utilizing molecular dynamics (MD) simulations and quantum mechanical calculations to understand the interactions between ILs and pentacene.
  • Characterization of the MMMs for their detection capabilities.

Main Results:

  • Successfully prepared solution-processable MMMs incorporating a pentacene-based dispersed phase within an IL continuous phase.
  • Computational studies confirmed hydrogen bonding and π-π interactions enhance pentacene dissolution in ILs.
  • The developed MMMs demonstrated easy-operation and on-site detection of carcinogenic primary aromatic amines via an eye-readable fluorescence signal.

Conclusions:

  • The study presents a novel conjugated molecule-based detector for hazardous aromatic amines.
  • The developed MMMs offer a practical and portable solution for rapid, on-site detection.
  • This work establishes a design strategy for portable testing devices for various hazardous compounds.