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7758-02-3

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7758-02-3 Usage

Chemical Description

Potassium bromide is a white crystalline powder used as a spectroscopic standard.

Chemical Properties

Potassium bromide is a white or colourless crystalline solid with a pungent strong bitter and saline taste, slightly hygroscopic and soluble in water and very slightly soluble in ethanol and ether; cubic; r.d. 2.75; m.p. 734°C; b.p. 1435°C. Potassium bromide maybe prepared by the action of bromine on hot potassium hydroxide solutionor by the action of iron(III) bromideor hydrogen bromide on potassium carbonate solution. It is used widely in the photographic industry and is also used as a sedative. Because of itsrange of transparency to infrared radiation,KBr is used both as a matrix for solid samples and as a prism materialin infrared spectroscopy.

Uses

Potassium bromide was used as a secondary halide in combination with an iodide in the paper negative processes, the albumen on glass process, and the wet collodion processes. When silver bromide gelatin emulsion was invented, potassium bromide was the primary halide. It was also used in combination with either bichloride of mercury, copper sulfate, or potassium ferricyanide in photographic bleaches and as a restrainer in alkaline developers used for gelatin plates and developing-out papers.

Application

Potassium bromide is widely used in optics because KBr has a low refractive index and a wide spectral range into the infrared with nearly no absorption. As a result, KBr is widely used as infrared optical windows, as infrared beamsplitters, and as substrates for interferometers. Commonly KBr is used in transmission infrared spectroscopy as a media for powder samples. The KBr and powder are ground together and pressed, using a die, into a thin disc under vacuum. The disc suspends the sample without contributing to the transmitted signal. Potassium bromide has also been used in synthesis, commonly as a source of bromide ions. For example, double displacement of KBr and bismuth nitrate yielded nanosheets of bismuth oxybromide. Solutions of KBr have also been found to be useful shape-control agents or crystal-habit modifiers in formation of metal nanocrystals, including palladium nanorods and bimetallic platinum-paladium nanocrystals. KBr is a common source of bromide ions used as nucleophiles in organic chemistry.

Preparation

Potassium bromide was produced by the action of bromine on hot potassium hydroxide solution or Reacting elemental bromine with potassium hydroxide or potassium iodide will produce the potassium bromide salt:KOH + Br2 → KBr + HOBrKI + Br2 → KBr + I2The reaction of bromine with potassium carbonate and urea is the basis of the process. The first step of the process involves the addition of K2SO4 to the potassium carbonate solution, followed by heating to 80 °C. After the lead-containing precipitate is removed by filtration, the bromine and urea are added, and the temperature and pH are adjusted to 30 °C and 6.0-6.5, respectively. Potassium bromide is recovered by recrystallization after reduction of volume of the reacting solution by evaporation. The sulfate can be removed from the solution by addition of BaBr2.

Definition

ChEBI: Potassium bromide is a metal bromide salt with a K(+) counterion. It is used in the manufacture of photographic film, developer, film thickener, toner and color photo bleach.

General Description

Potassium bromide is a white salt that crystallizes in the cubic rock salt structure, like sodium chloride. KBr is hygroscopic, deliquescent, highly soluble in water, and soluble in some polar organic solvents like glycerol, ethylene glycol, liquid ammonia, and hot ethanol, but insoluble in acetone. Aqueous solutions are neutral (pH about 7). When dissolved, KBr dissociates completely into its ions, making it a useful source of bromine ions in double displacement reactions or salt metathesis reactions. For example, this property was used in the production photographic films of silver bromide: KBr was reacted with silver nitrate to precipitate silver bromide, a salt that decomposes on exposure to light.

Reactivity Profile

Potassium bromide is not in generally strongly reactive. A weak reducing agent, incompatible with oxidizing agents. Also incompatible with salts of mercury and silver. Violent reactions occur with bromine trifluoride. May react with nitrous ether spirit, many alkaloidal salts and starch. May also react with acids . Reacts with concentrated sulfuric acid to generate fumes of hydrogen bromide.

Hazard

Toxic by ingestion and inhalation

Fire Hazard

Flash point data for Potassium bromide are not available; however, Potassium bromide is probably nonflammable.

Flammability and Explosibility

Nonflammable

Biochem/physiol Actions

Potassium bromide (KBr) is used as an anticonvulsant and sedative. KBr is used for optical windows and prisms. KBr is transparent in the wide wavelength range from near ultraviolet to long wave infrared. It is employed in the sample preparation for infrared transmission spectra.

Safety Profile

Moderately toxic by ingestion and intraperitoneal routes. Large doses can cause central nervous system depression. Prolonged inhalation may cause skin eruptions. Mutation data reported. Violent reaction with BrF3. When heated to decomposition it emits toxic fumes of K2O and Br-. See also BROMIDES.

Veterinary Drugs and Treatments

Bromides are used both as primary therapy and as adjunctive therapy to control seizures in dogs that are not adequately controlled by phenobarbital (or primidone) alone (when steady state trough phenobarbital levels are >30 mcg/mL for at least one month). While historically bromides were only recommended for use alone in patients suffering from phenobarbital (or primidone) hepatotoxicity, they are more frequently used as a drug of first choice. Although not frequently used, bromides are also considered suitable by some for use in cats with chronic seizure disorders, but cats may be more susceptible to the drug’s adverse effects.

Purification Methods

Crystallise the bromide from distilled water (1mL/g) between 100o and 0o. Wash it with 95% EtOH, followed by Et2O. Dry it in air, then heat it at 115o for 1hour, pulverize it, then heat it in a vacuum oven at 130o for 4hours. It has also been crystallised from aqueous30% EtOH, or EtOH, and dried over P2O5 under vacuum before heating in an oven.

Check Digit Verification of cas no

The CAS Registry Mumber 7758-02-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,5 and 8 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 7758-02:
(6*7)+(5*7)+(4*5)+(3*8)+(2*0)+(1*2)=123
123 % 10 = 3
So 7758-02-3 is a valid CAS Registry Number.
InChI:InChI=1/BrH.K/h1H;/q;+1/p-1

7758-02-3 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • Alfa Aesar

  • (10837)  Potassium bromide, Puratronic?, 99.999% (metals basis)   

  • 7758-02-3

  • 10g

  • 921.0CNY

  • Detail
  • Alfa Aesar

  • (10837)  Potassium bromide, Puratronic?, 99.999% (metals basis)   

  • 7758-02-3

  • 50g

  • 3257.0CNY

  • Detail
  • Alfa Aesar

  • (41282)  Potassium bromide, ultra dry, 99.95% (metals basis)   

  • 7758-02-3

  • 25g

  • 643.0CNY

  • Detail
  • Alfa Aesar

  • (41282)  Potassium bromide, ultra dry, 99.95% (metals basis)   

  • 7758-02-3

  • 100g

  • 1664.0CNY

  • Detail
  • Alfa Aesar

  • (43448)  Potassium bromide, ultra dry, 99.98% (metals basis)   

  • 7758-02-3

  • 25g

  • 769.0CNY

  • Detail
  • Alfa Aesar

  • (43448)  Potassium bromide, ultra dry, 99.98% (metals basis)   

  • 7758-02-3

  • 100g

  • 2315.0CNY

  • Detail
  • Alfa Aesar

  • (43448)  Potassium bromide, ultra dry, 99.98% (metals basis)   

  • 7758-02-3

  • 500g

  • 8665.0CNY

  • Detail
  • Alfa Aesar

  • (14700)  Potassium bromide, ultra dry, 99.9% (metals basis)   

  • 7758-02-3

  • 25g

  • 591.0CNY

  • Detail
  • Alfa Aesar

  • (14700)  Potassium bromide, ultra dry, 99.9% (metals basis)   

  • 7758-02-3

  • 100g

  • 1723.0CNY

  • Detail
  • Alfa Aesar

  • (14700)  Potassium bromide, ultra dry, 99.9% (metals basis)   

  • 7758-02-3

  • 500g

  • 6451.0CNY

  • Detail
  • Alfa Aesar

  • (38487)  Potassium bromide crystal optic rectangle, 41mm x 23mm x 6mm (drilled), polished both sides   

  • 7758-02-3

  • 1each

  • 1127.0CNY

  • Detail
  • Alfa Aesar

  • (39794)  Potassium bromide, FTIR Grade   

  • 7758-02-3

  • 25g

  • 850.0CNY

  • Detail

7758-02-3SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 16, 2017

Revision Date: Aug 16, 2017

1.Identification

1.1 GHS Product identifier

Product name potassium bromide

1.2 Other means of identification

Product number -
Other names Potassium bromide

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Adhesives and sealant chemicals,Intermediates,Photosensitive chemicals,Solvents (for cleaning or degreasing)
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:7758-02-3 SDS

7758-02-3Relevant articles and documents

A novel zero valent metal bismuth for bromate removal: Direct and ultraviolet enhanced reduction

Huang, Hong,Liu, Guoshuai,Wang, Xiuheng

, p. 4148 - 4155 (2020/02/04)

Bromate (BrO3-) is a carcinogenic and genotoxic by-product of the ozone disinfection process. In this study, a new zero-valent metal, bismuth, was used to reduce bromate. Bismuth samples were prepared by a solvothermal method and characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The morphology of the bismuth powder was microspheres assembled with dense nanosheets. The kinetics of the direct bromate reduction by bismuth accorded with the pseudo-first-order kinetics model. The rate coefficients of the initial bromate concentration of 1.00 mg L-1, 2.50 mg L-1, 5.00 mg L-1 were identically close to 0.08 min-1. For 0.20 mg L-1, a reaction rate coefficient near 0.10 min-1 was obtained. The reducing products of bromate included bromide ions (Br-) and bismuth oxybromides. The bromate removal efficiency was enhanced remarkably in the presence of ultraviolet (UV) light, and the corresponding kinetic coefficient was 4 times higher than that of direct reduction. The mechanism of ultraviolet enhancement was analyzed by diffuse reflectance spectroscopy (DRS), the density functional theory (DFT) calculation, open circuit potential (OCP) analysis, photocurrent measurement and linear sweep voltammetry (LSV). Besides, the influence of dissolved oxygen (DO) on bromate reduction efficiency and the sustainability of the as-prepared sample were investigated. DO inhibited the reduction rate obviously, but showed a slight effect on the formation of bromide ions. In the long-term periodic experiments, the kinetic coefficient decay occurred in both direct (without UV irradiation) and ultraviolet assisted bromate reduction. However, the kinetic coefficient of UV-assisted reduction (0.115 min-1) was about 2 times higher than that of the direct reduction in the last cycle of periodic experiments. In conclusion, the novel bromate reduction strategy based on the zero-valent bismuth metal material has been proved efficient and sustainable, which contributes to the development of drinking water treatment technologies.

Eu(O2C-C≡C-CO2): An EuII Containing Anhydrous Coordination Polymer with High Stability and Negative Thermal Expansion

Gramm, Verena K.,Smets, Daniel,Grzesiak, Ireneus,Block, Theresa,P?ttgen, Rainer,Suta, Markus,Wickleder, Claudia,Lorenz, Thomas,Ruschewitz, Uwe

, p. 2726 - 2734 (2020/02/20)

Anhydrous EuII–acetylenedicarboxylate (EuADC; ADC2? = ?O2C-C≡C-CO2 ?) was synthesized by reaction of EuBr2 with K2ADC or H2ADC in degassed water under oxygen-free conditions. EuADC crystallizes in the SrADC type structure (I41/amd, Z=4) forming a 3D coordination polymer with a diamond-like arrangement of Eu2+ nodes (msw topology including the connecting ADC2? linkers). Deep orange coloured EuADC is stable in air and starts decomposing upon heating in an argon atmosphere only at 440 °C. Measurements of the magnetic susceptibilities (μeff=7.76 μB) and 151Eu M?ssbauer spectra (δ=?13.25 mm s?1 at 78 K) confirm the existence of Eu2+ cations. Diffuse reflectance spectra indicate a direct optical band gap of Eg=2.64 eV (470 nm), which is in accordance with the orange colour of the material. Surprisingly, EuADC does not show any photoluminescence under irradiation with UV light of different wavelengths. Similar to SrADC, EuADC exhibits a negative thermal volume expansion below room temperature with a volume expansion coefficient αV=?9.4(12)×10?6 K?1.

Synthesis, characterization, and catalytic behavior of methoxy- and dimethoxy-substituted pyridinium-type ionic liquids

Manikandan, Chitrarasu,Ganesan, Kilivelu

, p. 3362 - 3367 (2014/12/11)

Synthesis of methoxy-substituted pyridinium-type ionic liquids from a nontoxic and easy method is described. Catalytic behaviors of synthesized ionic liquids were investigated with various concentrations for the Mannich reaction. We have observed that methoxy- and dimethoxy-substituted pyridinium bromides showed better catalytic behavior than other ionic liquids.

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