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Related Concept Videos

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.7K
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...
3.7K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.8K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.8K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.7K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.7K
Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

13.9K
In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated...
13.9K
Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

8.0K
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
8.0K
Nomenclature of Aromatic Compounds with a Single Substituent01:23

Nomenclature of Aromatic Compounds with a Single Substituent

10.2K
Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).
10.2K

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A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter
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A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter

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Proteinaceous Nano container Encapsulate Polycyclic Aromatic Hydrocarbons.

Matthew McDougall1,2, Olga Francisco1,2, Candice Harder-Viddal3

  • 1Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba, R3T 2N2, Canada.

Scientific Reports
|February 2, 2019
PubMed
Summary
This summary is machine-generated.

A novel nanotube matrix derived from deep-sea archaea rapidly binds toxic polycyclic aromatic hydrocarbons (PAHs). This RHCC-Nanotube (RHCC-NT) offers a promising solution for monitoring environmental PAH contamination.

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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Biotechnology

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) pose significant environmental and health risks due to their toxicity and persistence.
  • Effective monitoring and removal of PAHs are crucial environmental challenges.
  • Low molecular weight PAHs (2-4 rings) are particularly widespread and damaging.

Purpose of the Study:

  • To develop and characterize a novel nanotube matrix for the selective capture of low molecular weight PAHs.
  • To quantify the binding affinity and capacity of the new matrix for PAHs.
  • To assess the potential of the matrix as a monitoring tool for environmental PAHs.

Main Methods:

  • Synthesis of deep-sea archaea-derived RHCC-Nanotube (RHCC-NT) matrix.
  • Real-time binding quantification using fluorescence spectroscopy.
  • Structural analysis via X-ray crystallography.
  • Molecular dynamics (MD) simulations to understand binding interactions.
  • Measurement of PAH uptake rates under controlled conditions.

Main Results:

  • RHCC-NT demonstrates rapid and preferential binding of low molecular weight PAHs.
  • Binding coefficients range from 5.4 ± 1.6 μM (fluorene) to 32 ± 7.0 μM (acenaphthylene).
  • The matrix exhibits a binding capacity of 85 pmoles PAH per mg RHCC-NT.
  • Calculated pyrene uptake rate is 1.59 nmol/hr∙mol RHCC-NT at 10°C.

Conclusions:

  • RHCC-NT is a highly effective matrix for the selective capture of low molecular weight PAHs.
  • The unique properties of RHCC-NT make it ideally suited for environmental monitoring applications.
  • This research presents a significant advancement in PAH detection and remediation technologies.