4-NITROBENZENEDIAZONIUM TETRAFLUOROBORATE Property

Melting point:

144-148 °C (dec.)

Density 

1.66 g/cm3(Temp: 25 °C)

storage temp. 

2-8°C

solubility 

Soluble in acetonitrile and dimethyl sulfoxide.

form 

powder

color 

White to Yellow to Orange

Water Solubility 

almost transparency

BRN 

3599869

Exposure limits

ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3

Stability:

Stable. Incompatible with strong oxidizing agents, moisture, strong bases. Avoid mechanical shock.

CAS DataBase Reference

456-27-9(CAS DataBase Reference)

EPA Substance Registry System

Benzenediazonium, 4-nitro-, tetrafluoroborate(1-) (456-27-9)

Safety

Hazard Codes 

Xn,Xi,C

Risk Statements 

20/21/22-36/37/38-34

Safety Statements 

22-24/25-36/39-45-36/37/39-26

RIDADR 

UN 1759 8/PG 2

WGK Germany 

3

RTECS 

CZ1723000

F 

4.3

Hazard Note 

Irritant

TSCA 

Yes

HazardClass 

8

PackingGroup 

III

HS Code 

2931900090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

4-NITROBENZENEDIAZONIUM TETRAFLUOROBORATE Chemical Properties,Usage,Production

Chemical Properties

Pale Yellow Solid

Uses

4-Nitrobenzenediazonium tetrafluoroborate is widely used as a standard reagent in organic synthesis. It is used as a dye for enterochromaffin cells. It is used for the spectrophotometric determination of common aromatic diisocyanates [toluene-2,4-diyl diisocyanate and 4,4'-methylenebis(phenyl isocyanate)] and gallic acid. It is also used for tissue staining and determination of trace phenols.

Purification Methods

It crystallises from water. [Whetsch et al. J Am Chem Soc 78 3360 1956, Beilstein 16 IV 816.] It can be EXPLOSIVE when dry.