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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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, respectively.
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

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).
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
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Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
DNA Base Pairing02:27

DNA Base Pairing

Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...

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Related Experiment Video

Updated: May 11, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
14:11

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

Ion-pair-based assemblies comprising pyrrole-pyrazole hybrids.

Hiromitsu Maeda1, Kengo Chigusa, Tsuneaki Sakurai

  • 1College of Pharmaceutical Sciences, Ritsumeikan University, Kusatsu 525-8577, Japan. maedahir@ph.ritsumei.ac.jp

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 25, 2013
PubMed
Summary
This summary is machine-generated.

Modified dipyrrolylpyrazole derivatives form planar complexes with trifluoroacetate ions. Introducing alkyl chains on these complexes enables the creation of organized 2D structures, supramolecular gels, and mesophases.

Keywords:
assembled structuresion pairspi-conjugated moleculespyrrole derivativessoft materialssupramolecular chemistry

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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Last Updated: May 11, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
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Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Modified 3,5-dipyrrolylpyrazole (DPP) derivatives are key components in supramolecular chemistry.
  • Ion-pair assemblies offer versatile platforms for creating organized structures.
  • Trifluoroacetate (TFA) ions can interact with protonated DPP derivatives.

Purpose of the Study:

  • To investigate the formation of [2+2]-type complexes between protonated DPP derivatives and TFA ions.
  • To explore the role of aryl rings with long alkyl chains in organizing these complexes.
  • To demonstrate the potential for creating dimension-controlled supramolecular architectures.

Main Methods:

  • Synthesis of modified 3,5-dipyrrolylpyrazole derivatives.
  • Complexation studies with trifluoroacetate ions.
  • Characterization of resulting ion-pair assemblies using techniques like X-ray diffraction and microscopy.
  • Investigation of self-assembly behavior in solution and at interfaces.

Main Results:

  • Protonated DPP derivatives form planar [2+2]-type complexes with TFA ions.
  • The incorporation of aryl rings with long alkyl chains directs the self-assembly of these complexes.
  • Formation of stable 2D patterns at interfaces was observed.
  • The development of supramolecular gels and various mesophases was achieved.

Conclusions:

  • Modified DPP derivatives and TFA ions can form well-defined [2+2]-type complexes.
  • Alkyl chain functionalization is a crucial strategy for controlling the supramolecular organization of these complexes.
  • These findings provide a pathway for designing novel materials with tunable properties for applications in self-assembly and nanotechnology.