title: Boronium-cation-based ionic liquids as hypergolic fluids.
abstract: Two series of boronium-cation-based ionic liquids were prepared and fully characterized by (1)H, (13)C, and (11)B 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 % HNO(3).
authors.affiliation: Department of Chemistry, University of Idaho, Moscow, 83844-2343, USA.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.forename: Yanqiang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Deepak
authors.initials: D
authors.lastname: Chand
authors.forename: Damon A
authors.initials: DA
authors.lastname: Parrish
authors.forename: Jean'ne M
authors.initials: JM
authors.lastname: Shreeve