ChemicalBook CAS DataBase List 13499-05-3

13499-05-3

Name	HAFNIUM CHLORIDE
CAS	13499-05-3
EINECS(EC#)	236-826-5
Molecular Formula	Cl4Hf
MDL Number	MFCD00011034
Molecular Weight	320.3
MOL File	13499-05-3.mol

Synonyms

HAFNIUM CHLORIDE HAFNIUM(IV) CHLORIDE HAFNIUM TETRACHLORIDE (beta-4)-hafniumchloride(hfcl4 Hafnium chloride (HfCl4), (T-4)- HfCl4 HAFNIUM CHLORIDE, SUBLIMED, 99.9% HAFNIUM (IV) CHLORIDE ANHYDROUS 98+% (1-3% ZR) HAFNIUM (IV) CHLORIDE SUBLIMED GRADE (99.9+%-HF, <1.0% ZR) HAFNIUM (IV) CHLORIDE, SUBLIMED GRATE (99.9+%-HF, <0.5% ZR) HAFNIUM CHLORIDE ANHYDROUS Hafnium(IV) chloride,-80 mesh, 99% Hafnium(IV)chloride,sublimedgrade(99.9+%-Hf,<0.05%Zr) HAFNIUMANDITSCOMPOUNDS (beta-4)-hafnium chloride HAFNIUM(IV) CHLORIDE, ANHYDROUS (1-3% ZR) Hafnium chloride, 98+% (metals basis excluding Zr), Zr 2.7% Hafnium tetrachloride, sublimed: 99.95% (Hf+Zr)Cl4ü Hafnium chloride, 99%, 80 mesh Hafnium chloride(HfCl4)

Chemical Properties

Appearance	white fine crystalline powder
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
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 Data

Hazard Codes	C
Risk Statements	R34:Causes burns. less more
Safety Statements	S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice . S36/37/39:Wear suitable protective clothing, gloves and eye/face protection . S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . less more
RIDADR	UN 3260 8/PG 2
WGK Germany	3
F	9-21
TSCA	Yes
HazardClass	8
PackingGroup	II
HS Code	28273985

Hazard Information

Chemical Properties

white fine crystalline powder

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; hydrolyzes in water.

Uses

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

Preparation

Hafnium tetrachloride 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

Nonflammable

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.

Spectrum Detail

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