Tetrabutylammonium borohydride and its complex with aluminum borohydride

Titov, L. V.; Gavrilova, L. A.; Eremin, E. R.; Mishchenchuk, S. S.; Rosolovskii, V. Ya.

doi:10.1007/bf00855404

Cited by 9 publications

(13 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Effective synthesis of [CTA + ···Ag(SCN) 2 − ] was corroborated from the detection of −SCN asymmetric stretching band at 2109.34 cm −1 (Raman) 30,32 and at 2118 cm −1 (FTIR). The effective synthesis of [CTA + ···BH 4 − ] was corroborated, in similar way, by the detection of FTIR absorption bands at 1126 cm −1 , 2225 cm −1 and 2293 cm −1 which are respectively associated with the antisymmetric bending, the antisymmetric stretching and symmetric stretching of BH 4 − 27,30,33 . The detection of a broad Raman signal at 2266 cm −1 , associated with both 27,30,33 symmetric and antisymmetric stretching of BH 4 − , provides additional support to the effectiveness of the leaching procedure.…”

Section: Methodssupporting

confidence: 52%

“…Solid sodium borohydride (NaBH 4 ) was ground in a mortar into a fine powder, which was mixed with 50 mL of 10 mM CTAB chloroformic solution for leaching. The content of powdered NaBH 4 was set to be 10 times the CTAB mole amount contained in the leaching solution volume 27 . The mixture was kept under stirring during one day in a closed vessel at room-temperature to ensure the extraction process.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Morphological evolution of noble metal nanoparticles in chloroform: mechanism of switching on/off by protic species

et al. 2015

View full text Add to dashboard Cite

The morphological stability/morphological reshaping of noble metal nanoparticles are studied experimentally in order to unravel the chemical mechanisms lying beneath. Gold and silver nanoparticles (AuNPs and AgNPs, respectively) formed in chloroformic environment are used, as model synthetic systems, to study phenomena of morphological change. The morphological evolution of NPs that follows their formation, is characterized by spectroscopy (UV-Visible, Raman and FTIR) and TEM (Transmission Electron Microscopy). The change of NP morphology involves the increase of the average NP size and the broadening of size distribution, in a close resemblance with the effect characteristically obtained from the Ostwald ripening. The effect of the poor solvating properties of chloroform in stabilizing small charged species (H+, Ag+, Au+) as well as the principle of electroneutrality of matter are analyzed in order to formulate a feasible reaction scheme consisting of a three-step processes: the generation of soluble intermediary species by corrosion of nanoparticles, the diffusion of intermediary species from one nanoparticle to another, and the re-deposition process involving the reduction of intermediary species. This basic reaction scheme is used as hypothesis to plan and perform experiments, which reveal that molecular oxygen dissolved in the dispersive medium can drive NP corrosion, however, protic species are also required as co-reactant. The polarity of the hydrogen bond and the ligand properties of the anions produced by deprotonation are feature of the protic species that enable/disable the corrosion and, in turn, the NP morphological evolution.

show abstract

Section: Methodssupporting

confidence: 52%

Section: Methodsmentioning

confidence: 99%

Morphological evolution of noble metal nanoparticles in chloroform: mechanism of switching on/off by protic species

et al. 2015

View full text Add to dashboard Cite

show abstract

“…[10] Noeth and Ehemann reported trioctyl-n-propylammonium Al(BH 4 ) 4 À as a "viscous oil crystallizing very slowly". Tetrabutylammonium (TBA)Al-(BH 4 ) 4 À has a melting point of 50 8C, which is 75 8C lower than the uncomplexed borohydride.…”

mentioning

confidence: 99%

Green Bipropellants: Hydrogen‐Rich Ionic Liquids that Are Hypergolic with Hydrogen Peroxide

et al. 2011

View full text Add to dashboard Cite

Researchers working in the area of rocket propulsion strive for environmental friendliness, low toxicity, and overall operability, as well as a performance level comparable with current propellant combinations such as hydrazine and N 2 O 4 . Maintaining high performance while lowering hazards is extremely difficult.All rocket oxidizers are hazardous by their very nature, and so reduction of those hazards, even though the resulting materials might not be completely harmless, is at the heart of green initiatives in propulsion. The corrosivity of nitric acid is well known, and, although N 2 O 4 is much less corrosive, it combines high toxicity with high vapor pressure. A significant step to a lower-toxicity bipropulsion system would be the demonstration of hypergolicity (spontaneous ignition) between an ionic liquid (IL), which is a paragon of low vapor toxicity, and a safer oxidizer. Apart from cryogens, hydrogen peroxide seems to be especially promising because of its high performance, less-toxic vapor and corrosivity, and its environmentally benign decomposition products, [1] which make handling this oxidizer considerably less difficult than N 2 O 4 or nitric acid.A high fuel performance can be fostered by light metals with large combustion energies and relatively light products. Elements with considerable performance advantages and nontoxic products are aluminum and boron. The need for light combustion products through the production of hydrogen gas and water vapor is fulfilled by a high hydrogen content. Aluminum and boron are well known for their ability to serve as hydrogen carriers in neutral and ionic molecules. Defense research in the 1960s focused extensively on the development of hydrogen-containing fuels with boron, aluminum, and other metals, [2] but was mainly concerned with neutral compounds that have high vapor toxicity. Their rich anionic chemistry combined with the design flexibility of ILs presage novel materials that have the potential to overcome problems that caused these promising propellants to be abandoned.To date, no IL has been reported to be hypergolic with H 2 O 2 , and first-generation hypergolic ILs based on dicyanamide, nitrocyanamide, and azide anions lack high hydrogen content. [3] We tested ILs from each class with 90 % and 98 % H 2 O 2 , and all failed to ignite. This result is hardly surprising since fuels that are hypergolic with nitric acid vastly outnumber those that ignite with N 2 O 4 . For many years, hydrazine was the only fuel hypergolic with H 2 O 2 . [4] Since solutions of lithium aluminum hydrides and LiBH 4 in ethers have demonstrated H 2 O 2 hypergolicity, [5] the same behavior from ILs with metal hydride anions might be expected. However, the development of energetic roomtemperature ILs (RTILs) with metal hydride anions involves a number of technical challenges. Simple metal hydride anions are poor liquefying agents. Furthermore, heterocyclic, unsaturated salts that feature imidazolium, triazolium, pyridinium, and other common IL cations are reduced by BH 4 À ions,...

show abstract

“…TBAB has been first mentioned in 1971, but the crystal structure of this compound has not been reported so far [26]. On the other hand, TBAYB is a new compound, homologous to the recently synthesized tetramethylammonium salt [16].…”

Section: Resultsmentioning

confidence: 98%

Tetrabutylammonium cation in a homoleptic environment of borohydride ligands: [(n-Bu)4N][BH4] and [(n-Bu)4N][Y(BH4)4]

Jaroń

Wegner

Cyrański

et al. 2012

Journal of Solid State Chemistry

View full text Add to dashboard Cite

Tetrabutylammonium borohydride and its complex with aluminum borohydride

Cited by 9 publications

References 5 publications

Morphological evolution of noble metal nanoparticles in chloroform: mechanism of switching on/off by protic species

Morphological evolution of noble metal nanoparticles in chloroform: mechanism of switching on/off by protic species

Green Bipropellants: Hydrogen‐Rich Ionic Liquids that Are Hypergolic with Hydrogen Peroxide

Tetrabutylammonium cation in a homoleptic environment of borohydride ligands: [(n-Bu)4N][BH4] and [(n-Bu)4N][Y(BH4)4]

Contact Info

Product

Resources

About