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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
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2,2'-Dinitro-5,5'-dithio-dibenzoic acid.

Li-Jin Wang1

  • 1Department of Chemistry, Lishui University, Lishui 323000, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|May 18, 2011
PubMed
Summary
This summary is machine-generated.

This study details the crystal structure of 2,2'-dinitro-5,5'-dithio-dibenzoic acid (Dina), revealing unique zigzag chains formed by hydrogen bonds. These molecular arrangements differ from previously studied Dina structures.

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Materials Science

Background:

  • The crystal structure of 2,2 '-dinitro-5,5 '-dithio-dibenzoic acid (Dina) was investigated.
  • Previous studies reported a Dina structure involving a solvent water molecule.

Purpose of the Study:

  • To elucidate the crystal structure of Dina.
  • To compare the molecular conformation and hydrogen bonding in Dina with and without a solvent water molecule.

Main Methods:

  • X-ray crystallography was employed to determine the crystal structure.
  • Analysis of intermolecular interactions, specifically hydrogen bonds, was performed.
  • Dihedral angles between aromatic rings were measured and compared.

Main Results:

  • The asymmetric unit contains two independent Dina molecules with similar conformations.
  • Strong intermolecular O-H⋯O hydrogen bonds form one-dimensional zigzag chains along the a axis.
  • The dihedral angles between aromatic rings in the title compound are larger than in the previously reported structure with water.

Conclusions:

  • The crystal packing of Dina is influenced by intermolecular hydrogen bonding.
  • The absence of a solvent water molecule leads to altered dihedral angles between aromatic rings compared to hydrated structures.
  • Hydrogen bonding interactions play a crucial role in dictating the solid-state structure of Dina.