Caesiumbromid

Bezeichnung:Caesiumbromid

CAS-Nr7787-69-1

Englisch Name:Cesium bromide

CBNumberCB3745096

SummenformelBrCs

Molgewicht212.81

MOL-Datei7787-69-1.mol

Synonyma

Caesiumbromid

Caesiumbromid physikalisch-chemischer Eigenschaften

Schmelzpunkt	636 °C (lit.)
Siedepunkt	1300 °C
Dichte	4.44 g/mL at 25 °C (lit.)
Brechungsindex	1.6984
Flammpunkt	1300°C
Löslichkeit	H₂O: 3 M at 20 °C, clear, colorless
Aggregatzustand	beads
Wichte	4.44
Farbe	White
Wasserlöslichkeit	55 g/100 mL (20 ºC)
Sensitive	Hygroscopic
Merck	14,2009
Stabilität	Stable.
CAS Datenbank	7787-69-1(CAS DataBase Reference)
NIST chemische Informationen	Cesium bromide(7787-69-1)
EPA chemische Informationen	Cesium bromide (CsBr) (7787-69-1)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36/37/38
S-Sätze:	26-36
WGK Germany	3
RTECS-Nr.	FK9275000
TSCA	Yes
HS Code	28275900
Toxizität	LD50 i.p. in rats: 1.4 g/kg (Cochran)

Gefahreninformationscode (GHS)

Cesium bromide Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Beschreibung
Cesium bromide is a colorless crystal with the formula CsBr. It is a moderately water soluble crystalline Cesium source that decomposes to Cesium oxide on heating. Most metal bromine compounds are water-soluble and are used in water treatment, chemical analysis, and ultra-high purity for certain crystal growth applications.
Chemische Eigenschaften
Cesium bromide is a colourless crystals. It has been used in protein crystallization for anamolous scattering.
Verwenden
In x-ray fluorescent screens, spectrometer prisms, absorption-cell windows.
Verwenden
Cesium bromide is used as reagent, intermediate in pharmaceuticals.
Verwenden
Cesium bromide (CsBr) crystals are used in scintillation counters to detect radiation. The compound is also used to coat the inside of fluorescent screens.
Vorbereitung Methode
Single crystals Cesium bromide can be synthesized by the Kyropoulus method or the Stockbarger method. One can polish the crystal using pure alcohol.
synthetische
Caesium bromide can be prepared via following reactions:
Neutralization:
CsOH (aq) + HBr (aq) → CsBr (aq) + H2O (l)
Cs2(CO3) (aq) + 2 HBr (aq) → 2 CsBr (aq) + H2O (l) + CO2 (g)
Direct synthesis:
2 Cs (s) + Br2 (g) → 2 CsBr (s)
The direct synthesis is a vigorous reaction of caesium with other halogens. Due to its high cost, it is not used for preparation.
Sicherheitsprofil
Moderately toxic by intraperitoneal route. See also CESIUM and BROMIDES. When heated to decomposition it emits toxic fumes of Br-.
läuterung methode
It is very soluble in H2O, soluble in EtOH but insoluble in Me2CO. Dissolve it in the minimum volume of H2O, filter and precipitate it by adding Me2CO. Filter off the solid and dry it at 100o. Also recrystallise it from water (0.8mL/g) by partial evaporation in a desiccator.
Structure and conformation
The space lattice of CsBr(Cesium bromide) belongs to the cubic system, and its cesium chloride structure has a lattice constant of a=0.429 nm.

Caesiumbromid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

7787-69-1, Cesium bromide Verwandte Suche:

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