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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Taming Tin(IV) Polyazides.

Rory Campbell1, Martin F Davis1, Mathew Fazakerley1

  • 1Department of Chemistry, The University of Sheffield, Brook Hill, S3 7HF (UK) https://www.sheffield.ac.uk/chemistry/staff/profiles/peter_portius.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 16, 2016
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Summary
This summary is machine-generated.

Researchers synthesized novel tin(IV) azide compounds, including charge-neutral Lewis base adducts and a hexa(azido)stannate salt. These tin azide complexes exhibit high thermal stability and exceptional nitrogen content.

Keywords:
azideshypercoordinationmain group elementspolyazidesweakly coordinating cations

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Tin(IV) compounds are versatile in chemical synthesis.
  • Azide chemistry is crucial for energetic materials and synthetic transformations.
  • Previous research on tin azides was limited, particularly concerning charge-neutral adducts.

Purpose of the Study:

  • To synthesize and characterize novel charge-neutral Lewis base adducts of tin(IV) tetraazide.
  • To prepare and investigate the properties of a hexa(azido)stannate salt.
  • To explore the thermal stability and nitrogen content of these new tin azide complexes.

Main Methods:

  • Synthesis of tin(IV) tetraazide adducts using covalent or ionic azide-transfer reagents.
  • Ligand-exchange reactions for adduct formation.
  • Characterization using IR and NMR spectroscopies, microanalysis, thermal methods, and single-crystal X-ray diffraction.

Main Results:

  • Successful synthesis of [Sn(N3)4(bpy)], [Sn(N3)4(phen)], [Sn(N3)4(py)2], and [(PPN)2Sn(N3)6].
  • All complexes exhibit a distorted octahedral Sn[N]6 coordination geometry.
  • The synthesized tin azides demonstrate enhanced thermal stability compared to silicon and germanium analogues.
  • Adducts achieved up to 44% nitrogen content, a record for Sn(IV) compounds.

Conclusions:

  • The study presents the first charge-neutral Lewis base adducts of tin(IV) tetraazide.
  • These novel tin azide complexes offer superior thermal stability and high nitrogen content.
  • The findings expand the scope of tin coordination chemistry and energetic materials.