Cadmium(I) tetrachloroaluminate
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| Names | |
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| IUPAC name
dicadmium(2+) bis( tetrachoridoaluminate(1−))
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| Identifiers | |
79110-87-5  |
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| Properties | |
| Cd2[AlCl4]2 | |
| Molar mass | 562.4123 g/mol |
| Appearance | white crystale |
| Melting point | 227 ° (decomp) |
| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Cadmium(I) tetrachloroaluminate is the inorganic compound with the formula Cd2(AlCl4)2, a tetrachloroaluminate of cadmium(I). It was the first compound reported (1961) that contained cadmium in the +1 oxidation state.[1] Subsequent studies of the Raman vibrational spectrum indicated the presence of a cadmium–cadmium bond,[2] which was confirmed by two separate X-Ray diffraction studies of single crystals.[3][4] The compound can therefore be compared to mercury(I) (mercurous) compounds (such as mercury(I) chloride), which contain Hg2+
2.
Preparation and properties
Cd2(AlCl4)2 was originally prepared by dissolving Cd metal in molten CdCl2 followed by the addition of AlCl3.
- CdCl2 + Cd → Cd2Cl2
- Cd2Cl2 + 2 AlCl3 → Cd2(AlCl4)2
Cd2(AlCl4)2 is diamagnetic. It contains no unpaired electrons and reacts readily with water disproportionating to give Cd metal and Cd2+.
It has a complex structure that contains ethane-like Cd2Cl6 units sharing vertices with AlCl4 units, with a Cd–Cd bond length reported as 257.6 pm[3] or 256.1pm.[4]
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