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Asymmetrically substituted 5,5'-bistriazoles--nitrogen-rich materials with various energetic functionalities
Alexander A Dippold1, Thomas M Klapötke, Michaela Oswald
1Department of Chemistry, Ludwig Maximilian Universität München, Butenandstr. 5-13, Haus D, Munich, Germany. alexander.dippold@cup.uni-muenchen.de
Dalton Transactions (Cambridge, England : 2003)
|June 28, 2013
Summary
This study synthesizes and characterizes novel energetic bis-1,2,4-triazoles with various functional groups. The research details their structural, spectroscopic, and energetic properties, offering insights into high-energy materials.
Area of Science:
- Materials Science
- Organic Chemistry
- Energetic Materials
Background:
- Bis-1,2,4-triazoles are a class of nitrogen-rich compounds with potential applications as energetic materials.
- Understanding the influence of different energetic moieties on their properties is crucial for designing safer and more effective explosives and propellants.
Purpose of the Study:
- To synthesize and comprehensively characterize novel asymmetrically substituted bis-1,2,4-triazoles.
- To investigate the impact of various energetic functional groups (amino, nitro, nitrimino, azido) and ionic derivatives on structural and energetic properties.
- To compare the performance and sensitivity of these new compounds with established energetic materials like RDX.
Main Methods:
- Synthesis of asymmetrically substituted bis-1,2,4-triazoles and their ionic derivatives.
- Full structural and spectroscopic characterization using IR, Raman, and multinuclear NMR spectroscopy.
- Single crystal X-ray crystallography for detailed structural analysis.
- Computational calculations of standard enthalpies of formation (CBS-4M) and detonation parameters (EXPLO5).
Main Results:
- Successful synthesis and characterization of three asymmetrically substituted bis-1,2,4-triazoles and related ionic compounds.
- All synthesized compounds exhibited highly positive heats of formation.
- Detonation parameters were calculated and compared to RDX and symmetric bistriazoles.
- Sensitivity (impact, friction, electrostatic) and thermal stability were evaluated, showing strong dependence on the energetic moiety.
Conclusions:
- The energetic moiety significantly influences the structural and energetic properties of bis-1,2,4-triazoles.
- Ionic derivatives demonstrated good thermal stability and insensitivity, indicating potential for safer energetic material applications.
- This study provides valuable data for the rational design of new high-energy density materials.
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