Crystal Structure and Applications of Phosphorus Pentachloride
What is the chemical formula for
phosphorus pentachloride?
When heat
energy is released, phosphorus
pentachloride is a crystalline greenish-yellow material that is dissolved
by water into hydrochloric acid and phosphoric acid. It can also be made by
reacting phosphorus trichloride with dry chlorine. Phosphorus pentachloride has the chemical formula PCl5. It exists
as PCl4+ PCl6 in solid state.
In the
presence of phosphorus trichloride or chlorine gas, phosphorus pentachloride vaporises without dissociation. The
presence of the product shifts the dissociation equilibrium to the left.
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Phosphorus Pentachloride Structure
In gaseous
and liquid states, phosphorus pentachloride hybridization is sp3d,
with a trigonal bipyramidal geometry. It has three equatorial PCl bonds and two
axial PCl bonds.
Phosphorus Pentachloride (PCl5)
Chemical Properties
PCl5 PCl3 +
Cl2 is the dissociation of phosphorus
pentachloride.
PCl5 + 4H2O
H3PO4 + 5HCl PCl5 + 4H2O H3PO4 + 5HCl
Metal reaction:
Zn + PCl5 ZnCl2 + PCl3
Phosphorus
pentoxide reactions: 6PCl5 + P4O10 = 10POCl3
Sulfur
dioxide reactions: SO2 + PCl5 POCl3 + SOCl2
Phosphorus Pentachloride's Negative
Effects
The chemical
phosphorus pentachloride is a
reactive substance. Phosphorus Pentachloride
can cause weakness, nausea, headaches, dizziness, and vomiting when inhaled
directly. It has the potential to harm the liver and kidneys.
PCl5 (Phosphorus Pentachloride) has a
variety of applications.
benzenesulfonyl
chloride
malonic
dinitrile
aromatic
sulfonyl chlorides
It's used to
chlorinate water.
In the
pharmaceutical business, it is used to make penicillin and cephalosporin.
It's used to
make acid chlorides.
It's used as
a catalyst in the production of acetyl cellulose, as well as condensation and
cyclization reactions.
Phosphorus
Pentachloride (PCl5) Preparation Methods P4 + 10SO2Cl2 4PCl5 + 10SO2
4PCl5 = P4 +
10Cl2
PCl5 = PCl3
+ Cl2
To convert
any substituted aldehyde into the equivalent vinyl halide, phosphorus
pentachloride can be used as a halogenating reagent. It can also be used to
make linear and cyclophosphazenes by reacting with ammonium chloride.
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