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Chemical Reactions in Aqueous Solutions03:03

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Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
Structure of Amines01:19

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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
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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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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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The binary silver nitrogen anion [Ag(N3)2]-.

Thomas M Klapötke1, Burkhard Krumm, Matthias Scherr

  • 1Department of Chemistry and Biochemistry, Ludwig-Maximilian University of Munich, Butenandtstrasse 5-13(D), D-81377 Munich, Germany.

Journal of the American Chemical Society
|January 9, 2009
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel silver-nitrogen compound, the diazido-argentate(I) anion, by reacting silver azide with specific azides. Cation choice influences the coordination of azide ions around silver in the resulting crystal structures.

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Area of Science:

  • Inorganic Chemistry
  • Crystal Engineering
  • Coordination Chemistry

Background:

  • Silver azide is a known energetic material and precursor in coordination chemistry.
  • The coordination behavior of silver(I) with azide ligands is of interest for novel material synthesis.
  • Previous studies have explored various silver-nitrogen compounds, but the diazido-argentate(I) anion was uncharacterized.

Purpose of the Study:

  • To synthesize and characterize the novel diazido-argentate(I) anion, [Ag(N(3))(2)](-).
  • To investigate the influence of different counter-cations on the crystal structure and coordination environment of the anion.
  • To explore the formation of binary silver-nitrogen compounds through reactions involving silver azide.

Main Methods:

  • Reaction of silver azide with triphenylsulfonium azide and tetraphenylphosphonium azide.
  • Single-crystal X-ray diffraction analysis to determine the crystal structures of the synthesized salts.
  • Spectroscopic characterization (e.g., IR spectroscopy) to confirm the presence of the azide ligand and the [Ag(N(3))(2)](-) anion.

Main Results:

  • Successful synthesis of two novel salts containing the diazido-argentate(I) anion, [Ag(N(3))(2)](-).
  • Crystal structure determination revealed distinct coordination geometries of azide ligands around the silver(I) center, dependent on the cation (triphenylsulfonium or tetraphenylphosphonium).
  • The silver(I) ion is coordinated by two azide ligands, forming a linear or slightly bent [Ag(N(3))(2)](-) anion in the solid state.

Conclusions:

  • The diazido-argentate(I) anion, [Ag(N(3))(2)](-), represents a novel binary silver-nitrogen compound.
  • The coordination sphere around silver is significantly influenced by the steric and electronic properties of the counter-cation.
  • This study expands the known chemistry of silver-azide complexes and provides insights into cation-controlled crystal engineering.