AMMONIUM FLUOROBORATE

Fluoroboric acid is used in plating circuits; metal finishing; electropolishing of aluminium and its alloy; component of galvanic baths; organic synthesis as catalyst for alkylations and polymerisation; stabilisation of diazo salts; manufacturing of inorganic fluoroborate salts.

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Detailed Description for AMMONIUM FLUOROBORATE

Tetrafluoroborate is the anion BF4−. This tetrahedral species is isoelectronic with tetrafluoromethane, CF4 and tetrafluoroammonium NF4+, and is valence isoelectronic with many stable and important species including the closely related anion perchlorate, ClO4−. It arises by the reaction of fluoride salts with the Lewis acid BF3, treatment of tetrafluoroboric acid with base, or by treatment of boric acid with hydrofluoric acid.

The popularization of BF4− has led to decreased use of ClO4− in the laboratory. With organic compounds, especially amine derivatives, ClO4− forms potentially explosive derivatives. One disadvantage to BF4− is its slight sensitivity to hydrolysis, whereas ClO4− does not suffer from this problem. Safety considerations, however, overshadow this inconvenience.

 

The utility of BF4− arises because its salts are often more soluble in organic solvents than the related nitrate or halide salts. Furthermore, BF4− is less nucleophilic and basic than nitrates and halides. Thus, when using salts of BF4−, one can usually assume that the cation is the reactive agent and this tetrahedral anion is inert. BF4− owes its inertness to two factors: (i) it is symmetrical so that the negative charge is distributed equally over several (four) atoms, and (ii) it is composed of highly electronegative fluorine atoms, which diminish the basicity of the anion. Related to BF4− is hexafluorophosphate, PF6−, which is even more stable toward hydrolysis and whose salts tend to be more lipophilic.

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

white crystals

MELTING POINT

Decomposes

BOILING POINT  
SPECIFIC GRAVITY

1.85

SOLUBILITY IN WATER Readily soluble (Insoluble in alcohol)
pH mild acidic
VAPOR DENSITY  
AUTOIGNITION

 

NFPA RATINGS  

REFRACTIVE INDEX

 
FLASH POINT Not considered to be a fire hazard
STABILITY Stable under ordinary conditions. Moisture sensitive.

 

Fluoroboric acid is used in plating circuits; metal finishing; electropolishing of aluminium and its alloy; component of galvanic baths; organic synthesis as catalyst for alkylations and polymerisation; stabilisation of diazo salts; manufacturing of inorganic fluoroborate salts.

 

Inorganic fluoroborate salts are used as components of fluxing and plating, as catalysts, in flame-retardant manufacture, in metal treatment; grain refining agents; as active fillers in resin bonded abrasives; in electrolytic generation of boron, preparation of glazing frits.


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