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| Identifiers | |
|---|---|
3D model (JSmol) | |
| |
| |
| Properties | |
| K4[Mo2Cl8] | |
| Molar mass | 631.89 g·mol−1 |
| Appearance | red crystals |
| Density | 2.54 g/cm3 |
| soluble | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Potassium octachlorodimolybdate (systematically namedpotassium bis(tetrachloromolybdate)(Mo–Mo)(4−)) is aninorganic compound with thechemical formulaK4[Mo2Cl8]. It is known as a red-coloured, microcrystalline solid. The anion is of historic interest as one of the earliest illustrations of aquadruple bonding. The salt is usually obtained as the pink-coloureddihydrate.
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The compound is prepared in two steps frommolybdenum hexacarbonyl:[1][2]
The reaction of the acetate with HCl was first described as providing trimolybdenum compounds,[3] but subsequent crystallographic analysis confirmed that the salt contains the[Cl4Mo≣MoCl4]4−anion, with D4h symmetry, in which the twoMo atoms are linked by a quadruple bond. Each Mo atom is bounded with fourCl−ligands by asingle bond. EachMoCl4 group is aregular square pyramid, with an Mo atom at theapex, and fourCl atoms at the vertices of thesquare base of thepyramid. The Mo–Mo distance is 214 pm.[4]
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