Cadmium(I) tetrachloroaluminate

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Cadmium(I) tetrachloroaluminate
Cadmium(I)-tetrachloroaluminate-xtal-1987-unit-cell-CM-3D-ellipsoids.png
Identifiers
CAS number 79110-87-5 YesY
Properties
Molecular formula Cd2Al2Cl8
Molar mass 562.4123 g/mol
Appearance white crystale
Melting point 227 ° (decomp)
Except where noted otherwise, 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[edit]

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]

Cadmium(I)-tetrachloroaluminate-xtal-1987-Cd-coordination-CM-3D-ellipsoids.png

References[edit]

  1. ^ Corbett, J. D.; Burkhard, W. J.; Druding, L. F. (January 1961). "Stabilization of the Cadmium(I) Oxidation State. The System Cd-Cd1
    2
    (AlCl
    4
    )
    2
    –Cd2
    (AlCl
    4
    )
    2
    ". Journal of the American Chemical Society 83 (1): 76–80. doi:10.1021/ja01462a016.
      edit
  2. ^ Corbett, J. D. (Aug 1962). "The Cadmium(I) Ion Cd2+
    2
    . Raman Spectrum and Relationship to Hg2+
    2
    ". Inorganic Chemistry 1 (3): 700–703. doi:10.1021/ic50003a051.
      edit
  3. ^ a b Faggiani, R.; Ronald J. Gillespie; John E. Vekris (1986). "The cadmium(I) ion, Cd2+
    2
    ; X-ray crystal structure of Cd
    2
    (AlCl
    4
    )
    2
    ". Journal of the Chemical Society Chemical Communications 1986 (7): 517–518. doi:10.1039/C39860000517.
      edit
  4. ^ a b Staffel, T.; Dr. Gerd Meyer (1987). "Synthesis and crystal structures of Cd[AlCl
    4
    ]
    2
    and Cd
    2
    [AlCl
    4
    ]
    2
    ". Zeitschrift für anorganische und allgemeine Chemie 548 (5): 45–54. doi:10.1002/zaac.19875480505.
      edit