3D model (Jmol)
|Molar mass||273.62 g/mol (anhydrous)
381.71 g/mol (hexahydrate)
|Appearance||violet hygroscopic monoclinic crystals (anhydrous)
pink hygroscopic crystals (hexahydrate)
|Density||4.1 g/cm3 (anhydrous)|
|Melting point||776 °C (1,429 °F; 1,049 K) (anhydrous)
|Boiling point||1,500 °C (2,730 °F; 1,770 K)|
|soluble in water (anhydrous)
slightly soluble in ethanol (hexahydrate)
|Holmium(III) chloride, Thulium(III) chloride|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
It is also found as a pink crystalline hexahydrate, CAS number [10025-75-9]. It has the interesting property that the pink colour is much more intense under the light from a fluorescent lamp, as may be seen from the picture.
Anhydrous erbium(III) chloride is formed from the hexahydrate by heating under a strongly chlorinating atmosphere, such as chlorine or hydrogen chloride; otherwise erbium oxide chloride, ErOCl, is formed. An alternative preparation is to react the readily available Er2O3 with excess NH4Cl to make the intermediate salt (NH4)3ErCl6 plus both ammonia and water. This salt is stable with respect to hydrolysis and can be thermally decomposed under vacuum to yield anhydrous erbium(III) chloride with loss of ammonia and gaseous HCl.
It reacts with alkalis to form erbium(III) hydroxide:
ErCl3 + 3 XOH → Er(OH)3 + 3 XCl
Erbium(III) chloride hexahydrate also forms monoclinic crystals with the point group of P2/n (P2/c) - C42h. The erbium is octa-coordinated to form [Er(H2O)6Cl2]+ ions with the isolated Cl− completing the structure.
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- CSIRO PUBLISHING - Australian Journal of Chemistry