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Related Concept Videos

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).
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Chemical Ionization (CI) Mass Spectrometry

The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...

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Related Experiment Video

Updated: Jun 2, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Imidazole-imidazolium picrate monohydrate.

Rodolfo Moreno-Fuquen, Regina De Almeida Santos, Lina Aguirre

    Acta Crystallographica. Section E, Structure Reports Online
    |April 28, 2011
    PubMed
    Summary

    This study details the crystal structure of a diimidazolium picrate salt hydrate. Hydrogen bonding interactions form intricate two- and three-dimensional networks within the crystal lattice.

    Area of Science:

    • Crystallography
    • Supramolecular Chemistry
    • Materials Science

    Background:

    • Understanding the self-assembly of organic molecules is crucial for designing new materials.
    • Hydrogen bonding plays a key role in the formation of ordered structures in crystals.
    • Diimidazolium salts and picrate anions are common components in crystal engineering studies.

    Purpose of the Study:

    • To characterize the crystal structure of a novel diimidazolium picrate salt hydrate.
    • To investigate the hydrogen bonding interactions and network formation in the crystal.
    • To provide insights into the supramolecular assembly of these organic components.

    Main Methods:

    • Single-crystal X-ray diffraction was used to determine the molecular and crystal structure.

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

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    Published on: February 7, 2017

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    Published on: June 10, 2021

  • Analysis of hydrogen bonding (N-H⋯O, N-H⋯N, O-H⋯O, C-H⋯O) was performed.
  • Topological analysis of the resulting network was conducted.

    • Main Results:

    • The asymmetric unit contains a diimidazolium cation, a picrate anion, and a water molecule.
    • A 2D network parallel to (001) is formed via N-H⋯O, N-H⋯N, and O-H⋯O hydrogen bonds.
    • Weak C-H⋯O interactions extend the network into a 3D structure with R(5)(5)(19) rings.

    Conclusions:

    • The crystal structure reveals a complex network stabilized by multiple hydrogen bonding interactions.
    • The formation of both 2D and 3D networks highlights the versatility of diimidazolium picrate systems in crystal engineering.
    • This structural information can guide the design of functional materials based on similar supramolecular assemblies.