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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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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Structures of the 2-nitrophenol alkali complexes in solution and the solid state.

Hendrik Reichelt1, Chester A Faunce1, Henrich H Paradies1

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This study reveals alkali metal ions form spherical clusters with 2-nitrophenol molecules in aqueous solutions. These molecular salt complexes exhibit distinct structures and coordination geometries depending on the alkali metal ion, influencing crystallization behavior.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Aqueous solutions of alkali metal salts and 2-nitrophenol (2-NP) are relevant in various chemical processes.
  • Understanding the self-assembly and structural properties of these molecular complexes is crucial for predicting their behavior.

Purpose of the Study:

  • To investigate the molecular salt structures formed between alkali metal ions (Me(+)) and 2-nitrophenol (2-NP) in aqueous solutions.
  • To determine the onset of crystallization as a function of concentration and temperature.
  • To elucidate the coordination geometries and cluster formations.

Main Methods:

  • Small-angle X-ray scattering (SAXS)
  • Wide-angle X-ray scattering (WAXS)
  • Membrane-pressure osmometry

Main Results:

  • Evidence for spherical clusters (12-14 Å diameter) and lamellae-like structures (∼290 Å thickness).
  • Formation of tetramer and pentamer 2-NP-Me(+) clusters for Li, Na, K, and Rb.
  • Diverse coordination symmetries observed: trigonal prism (D3h) and octahedral (D2h) for Li(+), Na(+), K(+), Rb(+); square antiprism (D4d) for Cs(+).
  • 2-NP residues are planar with van der Waals interactions between phenyl rings; no water ligands involved.

Conclusions:

  • Alkali metal ions and 2-nitrophenol form distinct molecular salt complexes in solution.
  • The size and geometry of these complexes vary with the alkali metal ion, influencing supramolecular assembly.
  • These findings provide insights into the fundamental interactions governing salt crystallization and complex formation in aqueous media.