Hafnium(IV) chloride Chemical Properties

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.

Sensitive 

Moisture Sensitive

Hydrolytic Sensitivity

7: reacts slowly with moisture/water

crystal system

Monoclinic

Merck 

14,4588

Space group

P2/c

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.6327	0.7377	0.62	90	109.05	90	0.2735

Exposure limits

ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3

InChIKey

PDPJQWYGJJBYLF-UHFFFAOYSA-J

CAS DataBase Reference

13499-05-3(CAS DataBase Reference)

EPA Substance Registry System

Hafnium chloride (HfCl4), (T-4)- (13499-05-3)

Safety Information

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-36/37/39-45

RIDADR 

UN 3260 8/PG 2

WGK Germany 

3

F 

9-21

TSCA 

Yes

HazardClass 

8

PackingGroup 

II

HS Code 

28273985

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

Hafnium(IV) chloride Usage And Synthesis

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.

Uses

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

Uses

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.

Uses

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.

Hafnium(IV) chloride(13499-05-3)Related Product Information

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