|Molar mass||631.9 g/mol|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Potassium octachlorodimolybdate (systematically named potassium bis(tetrachloridomolybdate)(Mo—Mo)(4−)) is an inorganic compound with the chemical formula K
8 (also written as K
4]). It is known as a red-coloured, microcrystalline solid. The anion is of historic interest as one of the earliest illustrations of a quadruple bonding. The salt is usually obtained as the pink-coloured dihydrate.
- 2 Mo(CO)6 + 4 HO2CCH3 → Mo2(O2CCH3)4 + 2 H2 + 12 CO
- Mo2(O2CCH3)4 + 4 HCl + 4 KCl → K4Mo2Cl8 + 4 HO2CCH3
The reaction of the acetate with HCl was first described as providing trimolybdenum compounds, but subsequent crystallographic analysis confirmed that the product contains the Mo2Cl4–
8 ion with D4h symmetry. The Mo—Mo distance is 2.14 Å.
- A. B. Brignole, F. A. Cotton, Z. Dori (1972). "Inorganic Syntheses". Inorg. Synth. Inorganic Syntheses 13: 81–89. doi:10.1002/9780470132449.ch15. ISBN 978-0-470-13244-9.
- Girolami, G. S.; Rauchfuss, T. B., Angelici, R. J. (1999). Synthesis and Technique in Inorganic Chemistry. Mill Valley, CA: University Science Books. ISBN 0-935702-48-2.
- G.B. Allison, I.R. Anderson, J.C. Sheldon (1967). "The Preparation of Halogenotrimolybdate(II) Compounds". Australian Journal of Chemistry 20 (5): 869–876. doi:10.1071/CH9670869.
- Jurij V. Brencic and F. Albert Cotton (1969). ""Octachlorodimolybdate(II) Ion. Species with a Quadruple Metal-Metal Bond". Inorg. Chem. 8: 7–10. doi:10.1021/ic50071a002.