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Related Concept Videos

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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Nomenclature of Aryl and Heterocyclic Amines01:10

Nomenclature of Aryl and Heterocyclic Amines

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The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.6K
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...
2.6K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.6K
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...
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Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

5.5K
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).
5.5K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

2.7K
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.
2.7K

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1,6-Diazapyrene: A Novel, Well-Defined, Small-Size Prototype System for Nitrogen-Containing PAHs.

Indranil Bhattacharjee1, Liangxuan Wang1,2, Nerea Gonzalez-Sanchis3

  • 1Madrid Institute for Advanced Studies, IMDEA Nanoscience, C/Faraday 9, Ciudad Universitaria de Cantoblanco, Madrid 28049, Spain.

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Researchers synthesized 1,6-diazapyrene, a novel nitrogen-doped polycyclic aromatic hydrocarbon (N-doped PAH). This small molecule reveals how nitrogen placement impacts photophysical properties, crucial for designing new N-doped PAHs.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Nitrogen-doped polycyclic aromatic hydrocarbons (N-doped PAHs) are of interest for their unique properties.
  • Understanding structure-property relationships in N-doped PAHs requires well-defined model systems.

Purpose of the Study:

  • To synthesize a novel, small, and well-defined N-doped PAH prototype: 1,6-diazapyrene.
  • To investigate the photophysical and photochemical properties of 1,6-diazapyrene.
  • To elucidate the impact of aza-substitution position on these properties.

Main Methods:

  • Synthesis of 1,6-diazapyrene.
  • Optical spectroscopy.
  • (Time-dependent) Density Functional Theory ((TD-)DFT) calculations.
  • Analysis of MO symmetry, energy, and topology.

Main Results:

  • Successful synthesis of 1,6-diazapyrene.
  • Detailed elucidation of optical excitations and deactivation kinetics.
  • Demonstration of significant changes in photophysical and photochemical properties compared to pyrene and 2,7-diazapyrene.

Conclusions:

  • The position of nitrogen atoms in PAHs drastically influences their photophysical and photochemical behavior.
  • 1,6-diazapyrene serves as a valuable prototype for understanding N-doped PAHs.
  • Findings are highly relevant for the rational design of novel N-doped PAHs.