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Effect of Boron Clusters on the Ignition Reaction of HNO 3 and Dicynanamide-Based Ionic Liquids.
Journal of Physical Chemistry. A 2017 October 20
Many ionic liquids containing the dicynamide anion (DCA- , formula N(CN)2 - ) exhibit hypergolic ignition when exposed to the common oxidizer nitric acid. However, the ignition delay is often about 10 times longer than the desired 5 ms for rocket applications, so that improvements are desired. Experiments in the past decade have suggested both a mechanism for the early reaction steps and also that additives such as decaborane can reduce the ignition delay. The mechanisms for reactions of nitric acid with both DCA- and protonated DCAH are considered here, using accurate wave function methods. Complexation of DCA- or DCAH with borane clusters B10 H14 or B9 H14 - is found to modify these mechanisms slightly by changing the nature of some of the intermediate saddle points and by small reductions in the reaction barriers.
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