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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.6K
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...
3.6K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.5K
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...
3.5K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

12.1K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
12.1K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

5.1K
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,...
5.1K
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

6.6K
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
6.6K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

3.3K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
3.3K

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5,7,12,14-Tetrafunctionalized 6,13-Diazapentacenes.

Gaozhan Xie1, Miriam Hauschild1, Hendrik Hoffmann1

  • 1Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 15, 2019
PubMed
Summary

Researchers synthesized novel tetrafunctionalized diazapentacenes, achieving stable crystalline materials. One derivative demonstrated potential as an n-channel semiconductor in organic field-effect transistors, highlighting advancements in organic electronics.

Keywords:
X-ray diffractiondiazapentacenesheteroacenestetrasubstitution

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Solid-State Physics

Background:

  • Diazapentacenes are a class of polycyclic aromatic hydrocarbons with potential applications in organic electronics.
  • Functionalization of the diazapentacene core is crucial for tuning their electronic and structural properties.
  • Developing stable, processable organic semiconductors remains a key challenge in the field.

Purpose of the Study:

  • To synthesize and characterize novel tetrafunctionalized diazapentacene derivatives.
  • To investigate the structural properties using single crystal X-ray diffraction.
  • To evaluate the performance of a selected derivative as an n-channel semiconductor in organic field-effect transistors (OFETs).

Main Methods:

  • Synthesis initiated from tetrabromo-N,N-dihydrodiazapentacene or diazapentacene tetraketone precursors.
  • Palladium-catalyzed coupling reactions and lithium acetylide additions were employed.
  • Subsequent redox reactions yielded the target diazapentacene compounds.
  • Single crystal X-ray diffraction was used for structural determination.
  • Fabrication and testing of organic field-effect transistors (OFETs) to assess semiconductor performance.

Main Results:

  • Four distinct 5,7,12,14-tetrafunctionalized diazapentacenes were successfully synthesized.
  • Stable crystalline materials were obtained, confirmed by structural analysis.
  • The tetraphenyl-substituted diazapentacene exhibited n-channel semiconductor behavior in OFET devices.

Conclusions:

  • The study presents a viable synthetic route to novel tetrafunctionalized diazapentacenes.
  • The structural and electronic properties of these compounds are amenable to tuning through functionalization.
  • The demonstrated n-channel semiconductor performance opens avenues for their application in organic electronics.