The enthalpies of reaction of Mo(CO)6 and of W(CO)6 with iodine vapour at temperatures in the range 520–540 K to form the tri-iodides of the metals have been measured with a Calvet high-temperature microcalorimeter. The results lead to ΔHf°(Mol3,c)=–113 ± 10 kJ mol–1![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
–27·0 ± 2·5 kcal mol–1 and ΔHf°(Wl3,c)=–46 ± 13 kJ mol–1–11·0 ± 3 kcal mol–1 for the standard enthalpies of formation at 298 K.
Y. Virmani, D. S. Barnes and H. A. Skinner, J. Chem. Soc., Dalton Trans., 1974, 399 DOI: 10.1039/DT9740000399
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