Coordination Competition Strategy for Constructing High-Energy Photosensitive Complexes.

Area of Science:

• Materials Science
• Chemistry
• Energetic Materials

Background:

• High-dimensional energetic coordination compounds (ECCs) offer high stability and low sensitivity due to their complex structures.
• ECCs are valuable in applications like combustion catalysis and insensitive explosives.

Purpose of the Study:

• To synthesize and characterize novel ECCs using 5,5'-dinitro-4H,4'H-3,3'-bi(1,2,4-triazole) (DNBT) as ligands.
• To evaluate the laser-induced ignition and detonation capabilities of synthesized ECCs for potential use as laser initiators.

Main Methods:

• Synthesis of seven ECCs by modifying metal centers and using DNBT and 4H-1,2,4-triazol-4-amine (4-ATr) ligands.
• Laser ignition and detonation tests were performed on ECCs with reduced water content.
• Theoretical calculations and structural studies were conducted to analyze charge transfer behavior.

Main Results:

• Seven ECCs were successfully synthesized, with varying coordination structures.
• [Cu2(DNBT)2(4-ATr)3] demonstrated excellent laser response, featuring a low minimum laser initiation energy (11 mJ) and a short ignition delay (2.31 ms).
• [Co2(DNBT)2(4-ATr)3(H2O)2] showed less sensitivity to laser response, potentially due to water content, despite efficient photothermal conversion.

Conclusions:

• The synthesized ECCs, particularly copper-based compounds, show promise as laser initiators.
• The presence of water molecules in ECCs can influence their sensitivity to laser-induced initiation.
• Understanding charge transfer mechanisms is crucial for designing advanced energetic materials.