TELLURIUM TETRABROMIDE Struktur

Tellurtetrabromid

Bezeichnung:Tellurtetrabromid

CAS-Nr10031-27-3

Englisch Name:TELLURIUM TETRABROMIDE

CBNumberCB1495676

SummenformelBr4Te

Molgewicht447.22

MOL-Datei10031-27-3.mol

Synonyma

Tellurtetrabromid

Tellurtetrabromid physikalisch-chemischer Eigenschaften

Schmelzpunkt	~380 °C(lit.)
Siedepunkt	420 °C(lit.)
Dichte	4.3 g/mL at 25 °C(lit.)
Flammpunkt	420°C
Löslichkeit	reacts with H2O; soluble in ethyl ether
Aggregatzustand	beads
Farbe	yellow-orange monoclinic crystals, crystalline
Wasserlöslichkeit	It reacts with water and ethanol.
Sensitive	Moisture Sensitive
Merck	14,9125
Expositionsgrenzwerte	ACGIH: TWA 0.1 mg/m3 NIOSH: IDLH 25 mg/m3; TWA 0.1 mg/m3
CAS Datenbank	10031-27-3(CAS DataBase Reference)
EPA chemische Informationen	Tellurium bromide (TeBr4), (T-4)- (10031-27-3)

Sicherheit

Kennzeichnung gefährlicher	C
R-Sätze:	34
S-Sätze:	22-26-27-36/37/39-45
RIDADR	UN 3260 8/PG 2
WGK Germany	3
TSCA	Yes
HazardClass	8
PackingGroup	II

Gefahreninformationscode (GHS)

TELLURIUM TETRABROMIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R34:Verursacht Verätzungen.
S-Sätze Betriebsanweisung:
S22:Staub nicht einatmen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S27:Beschmutzte, getränkte Kleidung sofort ausziehen.
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).
Beschreibung
Tellurium tetrabromide is a iron-gray crystalline substance; stable even in moist air. Decomposes on heating, giving off I2. Hydrolyzed slowly in cold water, rapidly in warm water, forming TeO2 and HI.
Chemische Eigenschaften
Yellow crystals. Soluble in a little water (decomposes in excess water).
Verwenden
Tellurium tetrabromide?it acts as a chemical and organic intermediate. It is also acts a conductor.
synthetische
Pure Te (5 g.) is introduced through adapter a into the elongated reaction flask A of the apparatus shown in Fig.1. Adapter a is connected to a N2 purification train which furnishes either pure dry N2 or N2 containing bromine vapor. For the latter, the gas stream may be passed through a wash bottle containing dry Br2 , followed by a U tube containing P2O5-glass wool. First, the apparatus in purged with pure N2. Then A is cooled with ice water and the N2 -Br2 mixture is introduced. A portion of the Br2 condenses on the Te and reacts quietly with it, while the remainder is retained in the empty U tube D, cooled with an ice-salt mixture. The difference between the weight loss of the Br2 wash bottle and the weight of the condensate in D indicates the amount of bromine remaining in A. When this becomes about twice the amount needed for quantitative conversion to TeBr4, the gas stream is interrupted, stopcock C is closed, and the product slurry is allowed to stand at room temperature for several hours (better overnight) in order to complete the reaction. Then C is reopened and the excess bromine is purged by a stream of N2 while A is simultaneously heated to 50℃. To purify the product, it is sublimed in vacuum. Gas inlet tube a is sealed off at d, the whole apparatus is tilted to a horizontal position, and ground glass joint E is connected to an aspirator through a P2O5 drying tube. During evacuation, A is heated to sublimation temperature (about 350℃) with an electric furnace. Any black condensate which may separate in B at 200℃ is vaporized by heating with a burner. The subsequently deposited yellow to orange-red powder is quite pure TeBr4; if necessary, this can be further purified by an analogous sublimation in high vacuum.

Tellurtetrabromid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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