7788-97-8 Usage
Description
CHROMIUM(III) FLUORIDE, also known as Chromic fluoride, is a green crystalline solid that can be found in the form of dark green needles (anhydrous salt) or green hexagonal crystals (trihydrate). It has a density of 3.8 g/cm3 (anhydrous fluoride) and 2.2 g/cm3 (trihydrate). The anhydrous salt melts at 1,100°C and sublimes above this temperature. It is practically insoluble in water and ethanol (anhydrous salt), while the trihydrate is sparingly soluble in water. CHROMIUM(III) FLUORIDE is corrosive to metals and tissue and is used in various applications across different industries.
Uses
Used in Textile Industry:
CHROMIUM(III) FLUORIDE is used as a mordant for dyeing and printing woolens, which helps to improve the colorfastness and quality of the dyed fabric. It is also used for moth-proofing of woolen materials, providing protection against common fabric-damaging insects.
Used in Metal Polishing:
CHROMIUM(III) FLUORIDE is used as an abrasive in metal polishing, helping to achieve a smooth and shiny surface on various metal objects.
Used in Marble Coloring:
CHROMIUM(III) FLUORIDE is used as a coloring agent for marbles, enhancing their appearance and adding aesthetic value.
Used as a Halogenation Catalyst:
CHROMIUM(III) FLUORIDE is used as a catalyst in halogenation reactions, a chemical process that involves the addition of a halogen (such as fluorine, chlorine, bromine, or iodine) to a molecule.
Used in the Preparation of HFC-134a:
CHROMIUM(III) FLUORIDE is used in the preparation of a mixed-metal fluoride catalyst for the synthesis of HFC-134a, a refrigerant and propellant used in various applications.
Used in Rust-Prevention Paints:
CHROMIUM(III) FLUORIDE is used as a corrosion inhibitor in rust-prevention paints, helping to protect metal surfaces from rust and corrosion.
Preparation
Chromium(III) fluoride may be prepared by heating chromium trichloride under a stream of hydrogen fluoride:
The compound may be prepared by the reaction of chromium hydroxide with hydrofluoric acid:
Air & Water Reactions
Water soluble.
Reactivity Profile
Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas.
Hazard
Irritant to skin and eyes, especially in solution.
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Fire Hazard
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Flammability and Explosibility
Notclassified
Safety Profile
A poison by ingestion.
A corrosive. When heated to decomposition
it emits toxic vapors of Cr and F-.
Check Digit Verification of cas no
The CAS Registry Mumber 7788-97-8 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 8 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 7788-97:
(6*7)+(5*7)+(4*8)+(3*8)+(2*9)+(1*7)=158
158 % 10 = 8
So 7788-97-8 is a valid CAS Registry Number.
InChI:InChI=1/Cr.3FH/h;3*1H/q+2;;;/p-3
7788-97-8Relevant articles and documents
Synthesis of a porous chromium fluoride catalyst with a large surface area
Quan, Heng-Dao,Yang, Hui-E,Tamura, Masanori,Sekiya, Akira
, p. 254 - 257 (2005)
A novel approach to the preparation of a porous chromium fluoride catalyst with a large surface area is reported. The pores were generated by introduction of a siliceous material into the precursor of the catalyst and then removal of the material by reaction with anhydrous hydrogen fluoride. During the reaction, the formation and escape of a volatile gas (SiF4) from the precursor enlarged the surface area of the chromium fluoride. This process provided for the first time a porous chromium fluoride with a surface area of 187 m 2/g and a pore volume of 0.58 cm3/g. Furthermore, the porous chromium fluoride exhibited excellent chemical stability in the presence of HCl, HF, and F2. It was catalytically active for halogen exchange in a fixed-bed fluorination reaction, and it exhibited excellent catalytic performance in mitigating the coke formation on the surface of the catalyst during vapor-phase catalytic fluorination.
Chromium oxide trifluoride (CrOF3). Preparation and properties
Green,Johnson,Loehr,Gard
, p. 3562 - 3565 (1982)
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Structural and magnetochemical studies of Ba5Mn3F19 and related compounds AII5MIII3F19
Dahlke,Graulich,Welsch,Pebler,Babel
, p. 1255 - 1263 (2008/10/08)
Single crystal structure determinations by X-ray methods were performed at the following compounds, crystallizing tetragonally body-centred (Z = 4): Sr5V3F19 (a = 1423.4(2), c = 728.9(1) pm), Sr5Cr3F19 (a = 1423.5(2), c = 728.1(1) pm), Ba5Mn3F19 (a =1468.9(1), c =770.3(1) pm, Ba5Fe3F19 (a =1483.5(1), c =766.7 (1) pm), and Ba5Ga3F19 (a = 1466.0(2), c = 760.1(2) pm). Only Ba5Mn3F19 was refined in space group I4cm (mean distances for elongated octahedra Mn1-F: 185/207pm equatorial/axial; for compressed octahedra Mn2-F: 199/182 pm), the remaining compounds in space group I4/m. In all cases the octahedral ligand spheres of the M1 atoms showed disorder, the [M1F6] octahedra being connected into chains in one part of the compounds and into dimers in the other. The magnetic properties of the V, Cr and Mn compounds named above and of Pb5Mn3F19 and Sr5Fe3F19 as well were studied; the results are discussed in context with the in part problematic structures.
