Platinum(IV) iodide is a
inorganic compound
An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bondsthat is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''.
Inorgan ...
with the formula . it is a dark brown
diamagnetic
Diamagnetism is the property of materials that are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. In contrast, paramagnetic and ferromagn ...
solid and is one of several binary iodides of platinum.
Preparation
Platinum(IV) 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(IV) at 80 °C:
:
Physical properties
Platinum(IV) 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
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.
There are three main varieties o ...
, spatial group ''P m3m'', cell parameters a = 0.56 nm, Z = 1;
* ''γ''-,
tetragonal crystal system
In crystallography, the tetragonal crystal system is one of the 7 crystal systems. Tetragonal crystal lattices result from stretching a cubic lattice along one of its lattice vectors, so that the cube becomes a rectangular prism with a squa ...
, spatial group ''I 41/a'', cell parameters a = 0.677 nm, c = 3.110 nm, Z = 8.
Platinum(IV) iodide decomposes in water. It is also soluble in
ethanol
Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound with the chemical formula . It is an Alcohol (chemistry), alcohol, with its formula also written as , or EtOH, where Et is the ps ...
,
acetone
Acetone (2-propanone or dimethyl ketone) is an organic compound with the chemical formula, formula . It is the simplest and smallest ketone (). It is a colorless, highly Volatile organic compound, volatile, and flammable liquid with a charact ...
,
alkali
In chemistry, an alkali (; from the Arabic word , ) is a basic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0. The a ...
, HI, KI, liquid
.
Chemical properties
It decomposes when heated:
:
When dissolved in
hydroiodic acid
Hydroiodic acid (or hydriodic acid) is a colorless liquid. It is an aqueous solution of hydrogen iodide with the chemical formula . It is a strong acid, in which hydrogen iodide is ionized completely in an aqueous solution. Concentrated aqueous ...
, platinum(IV) iodide forms hydrogen hexaiodoplatinate(IV):
:
References
{{Iodides
Platinum compounds
Iodine compounds
Iodides