Anion-Driven Dimensionality Enhancement in Silver-Based Energetic MOFs for Laser-Induced Detonation

Area of Science:

• Materials Science
• Inorganic Chemistry
• Energetic Materials

Background:

• Energetic metal-organic frameworks (EMOFs) and nitrogen-rich ligands offer potential for primary explosives due to stability and tunable laser responsiveness.
• Developing new energetic materials with improved safety and performance is crucial.

Purpose of the Study:

• To synthesize and characterize novel Ag(I) compounds using a nitrogen-rich ligand, 6-(3,5-dimethyl-1H-pyrazol-1-yl)-[1,2,4]triazolo[4,3-b][1,2,4,5]tetrazin-3-amine (AMPTTz).
• To investigate the effect of anion modulation on structural dimensionality and energetic properties.
• To evaluate the laser responsiveness and explosive performance of the synthesized compounds.

Main Methods:

• Facile room-temperature evaporation synthesis of two Ag(I) compounds: [Ag(AMPTTz)NO3]n (compound 1) and [Ag2(AMPTTz)2(ClO4)2]n (compound 2).
• Structural analysis revealing compound 1 as a 1D coordination polymer and compound 2 as a 2D framework.
• Density measurements, thermal stability analysis, and mechanical sensitivity tests.

Main Results:

• Compound 2, a 2D framework, exhibited higher density (2.076 g·cm-3) compared to compound 1 (1.966 g·cm-3).
• The 2D compound demonstrated superior thermal stability and lower mechanical sensitivity than the 1D compound.
• Laser initiation and detonation tests confirmed the explosive performance of both compounds, with compound 2 showing better energetic performance.

Conclusions:

• Anion modulation effectively controlled the structural dimensionality of the Ag(I) compounds.
• The 2D energetic metal-organic framework (EMOF) compound offers a promising platform for high-performance, laser-responsive primary explosives.
• This study presents a feasible strategy for designing advanced energetic materials with tailored safety and performance characteristics.