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Energetic bicyclic azolium salts.

Ye Gao1, Chengfeng Ye, Brendan Twamley

  • 1Department of Chemistry, University of Idaho, Moscow, Idaho, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 5, 2006
PubMed
Summary

New bicyclic azole derivatives and their thermally stable azolium salts were synthesized and characterized. Their high densities and enthalpies of formation were determined, offering insights into energetic materials.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Energetic Materials

Background:

  • Bicyclic azoles are a class of heterocyclic compounds with potential applications in various fields.
  • The synthesis and characterization of novel azole derivatives are crucial for expanding their utility.
  • Understanding the properties of azolium salts, such as thermal stability and density, is important for their practical application.

Purpose of the Study:

  • To synthesize novel bicyclic azoles and their corresponding azolium salts.
  • To characterize the synthesized compounds, focusing on thermal stability and density.
  • To calculate the standard enthalpies of formation for the new azolium salts.

Main Methods:

  • Synthesis of bicyclic azoles and their quaternization to form azolium salts.

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  • Characterization techniques including single-crystal X-ray analysis.
  • Calculation of standard enthalpies of formation using DFT (B3LYP) and MP2 methods, combined with an empirical density-based approach.

    • Main Results:

    • Successful synthesis of six bicyclic azoles and their corresponding azolium salts.
    • Azolium salts exhibited high thermal stability with densities ranging from 1.519-1.674 g cm-3.
    • Calculated standard enthalpies of formation ranged from 209.9 to 412.3 kJ mol-1 for salts with densities >1.515 g cm-3.

    Conclusions:

    • The study successfully prepared novel bicyclic azoles and their thermally stable azolium salts.
    • The synthesized azolium salts possess high densities, indicating potential as energetic materials.
    • Computational methods provide reliable estimations of enthalpies of formation, correlating with experimental densities.