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Boronium‐Cation‐Based Ionic Liquids as Hypergolic Fluids
Author(s) -
Wang Kai,
Zhang Yanqiang,
Chand Deepak,
Parrish Damon A.,
Shreeve Jean'ne M.
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201347
Subject(s) - ionic liquid , differential scanning calorimetry , imidazole , chemistry , ionic bonding , infrared spectroscopy , standard enthalpy of formation , analytical chemistry (journal) , ion , organic chemistry , thermodynamics , physics , catalysis
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‐1 H ‐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‐1 H ‐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 .
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