Hafniumtetrachlorid

Bezeichnung:Hafniumtetrachlorid

CAS-Nr13499-05-3

Englisch Name:Hafnium(IV) chloride

CBNumberCB0731544

SummenformelCl4Hf

Molgewicht320.3

MOL-Datei13499-05-3.mol

Synonyma

Hafniumtetrachlorid

Hafniumtetrachlorid physikalisch-chemischer Eigenschaften

Schmelzpunkt	432 °C (lit.)
Siedepunkt	315.47°C (estimate)
Dichte	1.89 g/cm3
Dampfdruck	1 mm Hg ( 190 °C)
storage temp.	Inert atmosphere,Room Temperature
Löslichkeit	Soluble in methanol and acetone.
Aggregatzustand	Powder
Farbe	White
Wasserlöslichkeit	Soluble in water, methanol and acetone.
Hydrolytic Sensitivity	7: reacts slowly with moisture/water
Sensitive	Moisture Sensitive
Merck	14,4588
Expositionsgrenzwerte	ACGIH: TWA 0.5 mg/m3 NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3
InChIKey	PDPJQWYGJJBYLF-UHFFFAOYSA-J
CAS Datenbank	13499-05-3(CAS DataBase Reference)
EPA chemische Informationen	Hafnium chloride (HfCl4), (T-4)- (13499-05-3)

Sicherheit

Kennzeichnung gefährlicher	C
R-Sätze:	34
S-Sätze:	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

Gefahreninformationscode (GHS)

Hafnium(IV) chloride Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R34:Verursacht Verätzungen.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
Chemische Eigenschaften
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.
Physikalische Eigenschaften
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.
Verwenden
Hafnium tetrachloride is an important intermediate in production of hafnium metal. It also is used to prepare many hafnium compounds.
Verwenden
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.
Verwenden
Hafnium (IV) chloride can be used to catalyze the direct ester condensation of carboxylic acids with alcohols effectively.
synthetische
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.
Reaktionen
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 Upstream-Materialien And Downstream Produkte

Hafniumtetrachlorid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

13499-05-3, Hafnium(IV) chloride Verwandte Suche:

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