Post by Anders Hoveland on Jan 6, 2013 21:22:29 GMT -8
The B(NO3)4- ion shows surprising stability. It might make a good solid rocket fuel oxidizer. Either the ammonia salt, or possibly the hydroxylamine salt.
"The tetranitratoborate anion, [B(NO3)4]-, ... Surprisingly the anion is not hydrolyzed by water, it is soluble in hot water, methanol, acetonitrile, and may be recovered unchanged."
C.C. Addison and D. Sutton
Progress in Inorganic Chemistry, Volume 8, p216
Tetramethylammonium chloride can be reacted with BCl3 to form (CH3)4BCl4. This can then be reacted with N2O4 to form the tetranitratoborate complex, (CH3)4N[B(NO3)4]. The byproducts, NO2Cl / NO2 and Cl2, are easily volatized off. Although the tetranitratoborate complex is perfectly stable at room temperature, the reaction is best performed at reduced to temperature (liquid SO2 as solvent -20 °C) to prevent the undesirable formation of oxyboron nitrates.
N-methyl pyridinium tetranitratoborate is a liquid at room temperature, being an example of an ionic liquid.
I wonder whether a hydroxylamine tetranitratoborate salt is possible, whether tetranitratoborate shows any oxidizing behaviour, or if hydroxylamine would reduce the complex. I suspect not, but am not sure.
On the subject of complex perchlorate salts, I found this:
"Boron triperchlorate did not form an adduct with trimethylamine but did form a somewhat stable adduct with nitronium perchlorate. The compound is thermally unstable, B(ClO4)3 decomposing with evolution of chlorine heptoxide"
THE STUDY OF BORON PERCHLORATE AND RELATED SYSTEMS, R. A. Mosher, E. K. Ives, E. F. Morello
I think this adduct they are describing is probably NO2B(ClO4)4
(NO2)3Al(ClO4)6 was made by reacting NO2ClO4 and AlCl3 in liquid SO2 at -10 °C, reaction time 4 hours.
Anhydrous aluminum nitrate can be prepared from AlCl3 in N2O4 at 0 °C.
"The tetranitratoborate anion, [B(NO3)4]-, ... Surprisingly the anion is not hydrolyzed by water, it is soluble in hot water, methanol, acetonitrile, and may be recovered unchanged."
C.C. Addison and D. Sutton
Progress in Inorganic Chemistry, Volume 8, p216
Tetramethylammonium chloride can be reacted with BCl3 to form (CH3)4BCl4. This can then be reacted with N2O4 to form the tetranitratoborate complex, (CH3)4N[B(NO3)4]. The byproducts, NO2Cl / NO2 and Cl2, are easily volatized off. Although the tetranitratoborate complex is perfectly stable at room temperature, the reaction is best performed at reduced to temperature (liquid SO2 as solvent -20 °C) to prevent the undesirable formation of oxyboron nitrates.
N-methyl pyridinium tetranitratoborate is a liquid at room temperature, being an example of an ionic liquid.
I wonder whether a hydroxylamine tetranitratoborate salt is possible, whether tetranitratoborate shows any oxidizing behaviour, or if hydroxylamine would reduce the complex. I suspect not, but am not sure.
On the subject of complex perchlorate salts, I found this:
"Boron triperchlorate did not form an adduct with trimethylamine but did form a somewhat stable adduct with nitronium perchlorate. The compound is thermally unstable, B(ClO4)3 decomposing with evolution of chlorine heptoxide"
THE STUDY OF BORON PERCHLORATE AND RELATED SYSTEMS, R. A. Mosher, E. K. Ives, E. F. Morello
I think this adduct they are describing is probably NO2B(ClO4)4
(NO2)3Al(ClO4)6 was made by reacting NO2ClO4 and AlCl3 in liquid SO2 at -10 °C, reaction time 4 hours.
Anhydrous aluminum nitrate can be prepared from AlCl3 in N2O4 at 0 °C.