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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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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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...
2.9K
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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Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

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Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
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Structure of Amines01:19

Structure of Amines

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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’...
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Two-dimensional amine and hydroxy functionalized fused aromatic covalent organic framework.

Javeed Mahmood1, Ishfaq Ahmad1, Minbok Jung2

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Researchers developed a novel fused aromatic covalent organic framework (COF) using irreversible reactions. This robust, crystalline material offers enhanced stability, overcoming previous synthesis challenges.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Ordered two-dimensional covalent organic frameworks (COFs) are typically synthesized via reversible reactions.
  • Synthesizing ordered COFs using irreversible reactions presents significant challenges.
  • Developing COFs with fused aromatic systems via irreversible pathways is highly desirable.

Purpose of the Study:

  • To demonstrate a novel method for synthesizing ordered covalent organic frameworks (COFs) using irreversible condensation.
  • To create a robust, crystalline COF with a fused aromatic ring system.
  • To investigate the physiochemical stability of the synthesized material.

Main Methods:

  • Irreversible condensation (aromatization) of organic building blocks.
  • Characterization of the COF's lattice structure using scanning tunneling microscopy (STM).
  • Analysis of crystallinity using X-ray diffraction (XRD) patterns.

Main Results:

  • Successful synthesis of a highly crystalline, fused aromatic covalent organic framework (F-COF) via irreversible reaction.
  • Confirmation of the F-COF's ordered lattice structure through STM and XRD.
  • Demonstration of high physiochemical stability attributed to the fused aromatic system and absence of hydrolysable bonds.

Conclusions:

  • Irreversible condensation is a viable route for synthesizing ordered, robust covalent organic frameworks.
  • The developed F-COF exhibits superior stability compared to COFs synthesized via reversible reactions.
  • This work opens new avenues for designing stable COFs for advanced applications.