2MoI3 I2 + 2MoI2
or
6MoI3 3I2 + [Mo6I8]I4 [8]
The thermal decomposition of molybdenum(III) iodide to produce iodine and molybdenum(II) iodide (more precisely oktaiodomolybdenum(II)[8]). This reaction takes place at a temperature of over 100°C [8,17], in vacuo [8].