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HomeProduct name listHafnium(IV) chloride

Hafnium(IV) chloride

Synonym(s):Hafnium tetrachloride;Tetrachlorohafnium

  • CAS NO.:13499-05-3
  • Empirical Formula: Cl4Hf
  • Molecular Weight: 320.3
  • MDL number: MFCD00011034
  • EINECS: 236-826-5
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-08-28 13:53:20
Hafnium(IV) chloride Structural

What is Hafnium(IV) chloride?

Chemical properties

Hafnium(IV) chloride is the inorganic compound with the formula HfCl4. This colourless solid is the precursor to most hafnium organometallic compounds. It has a variety of highly specialized applications, mainly in materials science and as a catalyst.

Physical properties

White monoclinic crystal; sublimes at 317°C; melts at 432°C at 33 atm (triple point); critical temperature 452.5°C; critical pressure 53.49 atm; critical volume 314 cm3/mol.
Hafnium(IV) chloride.jpg

The Uses of Hafnium(IV) chloride

Hafnium tetrachloride is an important intermediate in production of hafnium metal. It also is used to prepare many hafnium compounds.

The Uses of Hafnium(IV) chloride

Hafnium chloride tetrahydrofuran complex is an efficient catalyst for the Diels-Alder cycloadditions, Ziegler-Natta polymerization of alkenes. It is used as control rods in nuclear reactors and in manufacture of light bulb filaments.

The Uses of Hafnium(IV) chloride

Hafnium (IV) chloride can be used to catalyze the direct ester condensation of carboxylic acids with alcohols effectively.

Preparation

Hafnium(IV) chloride can be prepared
(i) by chlorination of hafnium dioxide in the presence of carbon:
HfO2 + 2Cl2 + C → HfCl4 + 2CO
It also may be prepared by several other methods, such as
(ii) reaction of carbon tetrachloride with hafnium dioxide above 450°C;
(iii) heating a mixture of hafnium dioxide and carbon above 700°C;
and (iv) reaction of chlorine with hafnium at elevated temperatures.

Reactions

Hafnium(IV) chloride hydrolyzes, evolving hydrogen chloride:
HfCl4 + H2O→ HfOCl2+ 2 HCl
Aged samples thus often are contaminated with oxychlorides, which are also colourless.
THF forms a monomeric 2:1 complex:
HfCl4+ 2 OC4H8→HfCl4(OC4H8)2

Flammability and Explosibility

Non flammable

Solubility in organics

Soluble in methanol, acetone, reacts strongly with water, highly hygroscopic, hydrolyzes in water.

Structure and conformation

This group 4 halide contains hafnium in the +4 oxidation state. Solid Hafnium(IV) chloride is a polymer with octahedral Hf centers. Of the six chloride ligands surrounding each Hf centre, two chloride ligands are terminal and four bridge to another Hf centre.

Properties of Hafnium(IV) chloride

Melting point: 432 °C (lit.)
Boiling point: 315.47°C (estimate)
Density  1.89 g/cm3
vapor pressure  1 mm Hg ( 190 °C)
storage temp.  Inert atmosphere,Room Temperature
solubility  Soluble in methanol and acetone.
form  Powder
color  White
Water Solubility  Soluble in water, methanol and acetone.
Hydrolytic Sensitivity 7: reacts slowly with moisture/water
Sensitive  Moisture Sensitive
Merck  14,4588
Exposure limits ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3
CAS DataBase Reference 13499-05-3(CAS DataBase Reference)
EPA Substance Registry System Hafnium chloride (HfCl4), (T-4)- (13499-05-3)

Safety information for Hafnium(IV) chloride

Signal word Danger
Pictogram(s)
ghs
Corrosion
Corrosives
GHS05
GHS Hazard Statements H290:Corrosive to Metals
H314:Skin corrosion/irritation
Precautionary Statement Codes P234:Keep only in original container.
P260:Do not breathe dust/fume/gas/mist/vapours/spray.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Computed Descriptors for Hafnium(IV) chloride

InChIKey PDPJQWYGJJBYLF-UHFFFAOYSA-J

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