Boronium‐Cation‐Based Ionic Liquids as Hypergolic Fluids |
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| Authors: | Kai Wang Dr Yanqiang Zhang Deepak Chand Dr Damon A Parrish Prof Dr Jean'ne M Shreeve |
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| Institution: | 1. Department of Chemistry, University of Idaho, Moscow, ID, 83844‐2343 (USA), Fax: (+1)?208‐885‐9146;2. Naval Research Laboratory, Code 6030, Washington, DC 20375‐5001 (USA) |
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| Abstract: | Two series of boronium‐cation‐based ionic liquids were prepared and fully characterized by 1H, 13C, and 11B NMR and infrared spectroscopy, differential scanning calorimetry (DSC), and elemental analysis. The structure of bis(1‐methyl‐1H‐imidazole‐3‐yl)dihydroboronium dicyanoborohydride ( 5 a ) was determined by single‐crystal X‐ray diffraction. The densities of these ionic liquids range from 1.05 to 1.28 g cm?3, and the heats of formation, predicted on the basis of Gaussian 03 calculations, fall between ?164.6 and 430.5 kJ mol?1. Compound 5 b , bis(1‐allyl‐1H‐imidazole‐3‐yl)dihydroboronium dicyanoborohydride, exhibits the lowest viscosity (35 mPa s) and shortest ignition‐delay time (14 ms) in combination with 100 % HNO3. |
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| Keywords: | boronium cations hydrides hypergolic ignition ignition delay ionic liquids |
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