Platinum(IV) iodide


Platinum iodide is an inorganic compound with the formula. it is a dark brown diamagnetic solid and is one of several binary iodides of platinum.

Preparation

Platinum iodide can be prepared from the effect of iodine on platinum:
Iodide accelerates this process.
It can also be obtained from the decomposition of hydrogen hexaiodoplatinate at 80 °C:

Physical properties

Platinum iodide forms dark brown crystals of several modifications:α-, rhombic crystal system, spatial group P bca, cell parameters a = 1.290 nm, b = 1.564 nm, c = 0.690 nm, Z = 8;β-, cubic crystal system, spatial group P m3m, cell parameters a = 0.56 nm, Z = 1;γ-, tetragonal crystal system, spatial group I 41/a, cell parameters a = 0.677 nm, c = 3.110 nm, Z = 8.
Platinum iodide decomposes in water. It is also soluble in ethanol, acetone, alkali, HI, KI, liquid [ammonia|].

Chemical properties

It decomposes when heated:
When dissolved in hydroiodic acid, platinum iodide forms hydrogen hexaiodoplatinate: