3D model (JSmol)
|Molar mass||108.9913 g/mol (anhydrous) |
163.037 g/mol (trihydrate)
181.05 g/mol (tetrahydrate)
|Appearance||green crystalline solid|
|Density||3.8 g/cm3 (anhydrous) |
2.2 g/cm3 (trihydrate)
|Melting point||1,100 °C (2,010 °F; 1,370 K) (sublimes)|
|negligible (anhydrous) |
sparingly soluble (trihydrate)
|Solubility||insoluble in alcohols |
soluble in HF, HCl
|R-3c, No. 167|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|150 mg/kg (guinea pig, oral)|
|US health exposure limits (NIOSH):|
|TWA 1 mg/m3|
|TWA 0.5 mg/m3|
IDLH (Immediate danger)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Chromium(III) fluoride is the name for the inorganic compounds with the chemical formula CrF3 as well as several related hydrates. The compound CrF3 is a green crystalline solid that is insoluble in common solvents, but the coloured hydrates [Cr(H2O)6]F3 and [Cr(H2O)6]F3•3H2O are soluble in water. The trihydrate is green, and the hexahydrate is violet. The anhydrous form sublimes at 1100–1200 °C.
Like almost all compounds of chromium(III), these compounds feature octahedral Cr centres. In the anhydrous form, the six coordination sites are occupied by fluoride ligands that bridge to adjacent Cr centres. In the hydrates, some or all of the fluoride ligands are replaced by water.
Another method of synthesis of CrF3 involves thermal decomposition of (NH3)CrF6: (NH4)3CrF6 → CrF3 + 3NH3 + 3HF A mixed valence Cr2F5 is also known.
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