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Tetrabutylammonium hexafluorophosphate is a salt with the formula NBu 4 PF 6.It is a white powder that is used as an electrolyte in nonaqueous electrochemistry.It is highly soluble in polar organic solvents such as acetone and acetonitrile.
3 often prepared as the tributylammonium ((C 4 H 9) 3 NH +) or tetrabutylammonium ((C 4 H 9) 4 N + salt. The anion features phosphorus(V) bonded to three tetrachlorocatecholate (C 6 Cl 4 O 2− 2) ligands. This anion can be resolved into the axially chiral enantiomers, which are optically stable (the picture shows the Δ enantiomer).
The pyrophosphate bond is also sometimes referred to as a phosphoanhydride bond, a naming convention which emphasizes the loss of water that occurs when two phosphates form a new P−O−P bond, and which mirrors the nomenclature for anhydrides of carboxylic acids.
For example, treatment of Bu 4 NOH with disodium pyrophosphate, Na 2 H 2 P 2 O 7, gives (Bu 4 N) 3 [HP 2 O 7], which is soluble in organic solvents. [2] Similarly, neutralization of Bu 4 NOH with hydrofluoric acid affords a relatively water-free Bu 4 NF. This salt dissolves in organic solvents and is useful in desilylation. [3]
Because the fluoride ion is such a strong hydrogen bond acceptor, its salts tend to be hydrated and of limited solubility in organic solvents. As a fluoride ion source, TBAF solves this problem, although the nature of the fluoride is uncertain because TBAF samples are almost always hydrated, resulting in the formation of bifluoride (HF 2 −) hydroxide (OH −) as well as fluoride.
The last one is pyrophosphate [P 2 O 7] 4−. The pyrophosphates are mostly water-soluble. The pyrophosphates are mostly water-soluble. Likewise, tripolyphosphoric acid H 5 P 3 O 10 yields at least five anions [H 5− k P 3 O 10 ] k − , where k ranges from 1 to 5, including tripolyphosphate [P 3 O 10 ] 5− .
Tributyl phosphate is used in combination with di(2-ethylhexyl)phosphoric acid for the solvent extraction of uranium, as part of the purification of natural ores. [11] It is also used in nuclear reprocessing as part of the PUREX process.
Some tetrabutylammonium salts of simple anions include: tetrabutylammonium fluoride, a desilylation reagent.; tetrabutylammonium bromide, a precursor to other tetrabutylammonium salts via salt metathesis reactions.