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o-Carborane based and atomically-precise metal clusters as hypergolic materials.

Atomically-precise o-carboranealkynyl-protected clusters [Ag14(C4B10H11)12(CH3CN)2]•2NO3- (CBA-Ag) and [Cu6Ag8(C4B10H11)12Cl]NO3- (CBA-CuAg) have been found to exhibit hypergolic activity, such that they are capable of spontaneous ignition and combustion upon contact with the white fuming nitric acid oxidizer. In particular, CBA-CuAg has a short ignition delay time of 15 ms, whereas the o-carboranealkynyl ligand is hypergolically inert. Systematic investigation revealed that the metal cluster-core catalyzed the hypergolic behavior of inert o-carboranealkynyl ligand, and Cu-doping further accelerated combustion catalysis. This work provides a new prospective in the rational design of novel metal cluster-based hypergolic materials for propellant application.