7787-69-1 Usage
Description
Cesium bromide (CsBr) is a colorless crystalline compound that is highly soluble in water and has a high refractive index. It is known for its various applications in different industries due to its unique properties.
Uses
Used in X-ray Fluorescent Screens:
Cesium bromide is used as a scintillator in X-ray fluorescent screens for its ability to convert X-ray energy into visible light, enhancing the visibility of the screen.
Used in Spectrometer Prisms:
Cesium bromide is utilized as a material for spectrometer prisms due to its high refractive index, which allows for better dispersion of light and improved resolution in spectral analysis.
Used in Absorption-cell Windows:
Cesium bromide is employed as a window material in absorption cells, where it provides a clear and durable barrier that allows for the transmission of light while maintaining the integrity of the cell contents.
Used in Scintillation Counters:
Cesium bromide (CsBr) crystals are used in scintillation counters to detect radiation. Cesium bromide's scintillating properties make it an effective material for converting high-energy radiation into visible light, which can then be measured.
Used in Pharmaceutical Industry:
Cesium bromide is used as a reagent and intermediate in the pharmaceutical industry, where it plays a role in the synthesis of various drugs and medications.
Used in Protein Crystallization:
Cesium bromide has been used in protein crystallization for anomalous scattering, which is a technique employed to determine the structure of proteins and other macromolecules at the atomic level.
Preparation
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.
Safety Profile
Moderately toxic by
intraperitoneal route. See also CESIUM and
BROMIDES. When heated to
decomposition it emits toxic fumes of Br-.
Purification Methods
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.
Check Digit Verification of cas no
The CAS Registry Mumber 7787-69-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 7 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7787-69:
(6*7)+(5*7)+(4*8)+(3*7)+(2*6)+(1*9)=151
151 % 10 = 1
So 7787-69-1 is a valid CAS Registry Number.
InChI:InChI=1/BrH.Cs/h1H;/q;+1/p-1
7787-69-1Relevant articles and documents
Crystal growth and characterization of Eu2+ doped Cs1-xRbxCaBr3
Rebrova,Grippa, A.Yu.,Boiaryntseva,Berastegui,Gorbacheva,Pedash, V.Yu.,Galkin,Kononets,Datsko, Yu.N.,Cherginets
, (2020)
A series of Eu2+ doped Cs1-xRbxCaBr3 solid solutions were grown using the Bridgman-Stockbarger technique. Their photoluminescence and scintillation properties are studied. Upon optical and X-ray excitation, the Cs1-xRbxCaBr3 and Eu2+ activated samples show a band, which can be attributed to the 5d-4f transition in Eu2+. The decay time constants become shorter with increasing Rb content and lie in the range of 3–4 μs. The scintillation performance of solid solutions Cs1-xRbxCa0.95Eu0.05Br3 is improved compared with the end members (CsCa0.95Eu0.05Br3 and RbCa0.95Eu0.05Br3). The best energy resolution of 6.4% at 662 keV was determined for Cs0.2Rb0.8Ca0.95Eu0.05Br3, and the best light yield, equal to 61.2% of NaI:Tl, was demonstrated by Cs0.4Rb0.6Ca0.95Eu0.05Br3.
Hydrothermal Crystal Growth of Mixed Valence Cs2SbBr6
Combs, Victoria E.,Oswald, Iain W. H.,Neilson, James R.
, p. 4090 - 4094 (2019)
Mixed valence perovskite materials present an opportunity to understand how structural motifs influence electronic properties in semiconducting materials. Here, we report the preparation of high-quality single crystals of the mixed valence compound Cssub
Ion Exchange of Layered Alkali Titanates (Na2Ti3O7, K2Ti4O9, and Cs2Ti5O11) with Alkali Halides by the Solid-State Reactions at Room Temperature
Ogawa, Makoto,Saothayanun, Taya Ko,Sirinakorn, Thipwipa Tip
, p. 4024 - 4029 (2020/04/08)
Ion exchange of layered alkali titanates (Na2Ti3O7, K2Ti4O9, and Cs2Ti5O11) with several alkali metal halides surprisingly proceeded in the solid-state at room temperature. The reaction was governed by thermodynamic parameters and was completed within a shorter time when the titanates with a smaller particle size were employed. On the other hand, the required time for the ion exchange was shorter in the cases of Cs2Ti5O11 than those of K2Ti4O9 irrespective of the particle size of the titanates, suggesting faster diffusion of the interlayer cation in the titanate with lower layer charge density.
