Synthesis and characterization of the mixed-ligand coordination polymer Cu3Cl(N4C-NO2)2
Bradley Westwater1, Hayleigh J Lloyd, Inigo J Vitorica-Yrezabal
1Department of Chemistry, University of Sheffield, Sheffield, Western Bank, S3 7HF, UK. p.portius@sheffield.ac.uk.
Dalton Transactions (Cambridge, England : 2003)
|October 21, 2020
Summary
A novel copper coordination polymer, Cu3Cl(N4C-NO2)2, was synthesized and characterized. This highly sensitive explosive material exhibits greater density and lower thermal stability than DBX-1, with potential applications in energetic materials.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Energetic Materials
Background:
- Copper coordination polymers are of interest due to their diverse structural and electronic properties.
- Sodium 5-nitro-tetrazolate (NaNT) is a precursor to energetic materials.
- Copper(I) 5-nitrotetrazolate (DBX-1) is a known initiatory explosive.
Purpose of the Study:
- To synthesize and characterize a novel mixed-ligand copper(I) coordination polymer using sodium 5-nitro-tetrazolate.
- To compare the properties of the new compound with existing energetic materials like DBX-1.
- To investigate factors influencing the synthesis and stability of these compounds.
Main Methods:
- Synthesis of copper(I) 5-nitrotetrazolate and the novel coordination polymer Cu3Cl(N4C-NO2)2.
- Characterization using single crystal and powder X-ray diffraction (XRD), IR spectroscopy, magnetic and thermal measurements, elemental analysis, particle size analysis, and mass spectrometry.
- Sensitivity testing via drop weight analysis.
Main Results:
- Successful synthesis of a wine-red, air-stable, water-insoluble, crystalline explosive material, Cu3Cl(N4C-NO2)2.
- The new compound exhibits greater crystal density, lower thermal stability, and higher sensitivity to hydrolysis and shock compared to DBX-1.
- Crystallization of NaNT as a tetrahydrate improved the stability of the starting material.
Conclusions:
- A novel, highly sensitive copper coordination polymer explosive, Cu3Cl(N4C-NO2)2, has been synthesized and characterized.
- This material presents distinct properties compared to DBX-1, suggesting potential for tailored energetic applications.
- Control over synthesis and precursor stability are critical for obtaining pure energetic materials.
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