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.

中文翻译：

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基于邻碳硼烷和原子级精确的金属簇作为自燃材料

已发现原子级精确的邻碳炔基保护簇 [Ag14(C4B10H11)12(CH3CN)2]•2NO3- (CBA-Ag) 和 [Cu6Ag8(C4B10H11)12Cl]NO3- (CBA-CuAg) 具有自燃活性，这样它们在与发烟硝酸氧化剂接触时能够自燃和燃烧。特别是，CBA-CuAg 具有 15 ms 的短点火延迟时间，而 o-carboranealkynyl 配体是自高惰性的。系统研究表明，金属簇核催化了惰性邻碳炔基配体的自燃行为，Cu掺杂进一步加速了燃烧催化。这项工作为用于推进剂应用的新型金属簇基自燃材料的合理设计提供了新的前景。