One-dimensional copper bromide based inorganic-organic hybrids as fuels for hypergolic bipropellants with hydrogen peroxide as oxidizer

In this work, a series of unprecedented one-dimensional (1D) copper bromide-based inorganic–organic hybrids were synthesized as hypergolic fuels. In the absence of promoters, all 1D hybrids exhibited good hypergolic activity toward oxidant HTP (H₂O₂ with concentration of >95 %). Among the hybrids, the 1-propargyl-3-methylimidazolium bromide-based complex achieved the shortest ignition delay (ID) of 12 ms. The structure-performance relationships revealed that the abundant copper alkynyl bonds distributed in the 1D infinite Cu-Br chain functioned as interconnecting hotspots, which greatly promote the hypergolic efficiency. This work demonstrates that the hybrids combined with HTP have potential applications as green hypergolic bipropellants for rocket.