Cadmium iodide

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Cadmium iodide
IUPAC name cadmium(II) iodide
Other names cadmium iodide
cadmium diiodide
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Molar mass 366.20 g mol−1
Appearance white to pale yellow crystals
Density 5.640 g cm−3, solid
Melting point
Boiling point
Crystal structure rhombohedral
Related compounds
Other anions {{{value}}}
Other cations {{{value}}}
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

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Cadmium iodide, CdI2, is a chemical compound of cadmium and iodine. It is notable for its crystal structure, which is typical for compounds of the form MX2 with strong polarization effects.

Crystal structure

Cadmium iodide forms crystals with hexagonal symmetry. The iodide anions form a hexagonal close packed arrangement while the cadmium cations fill alternating layers of octahedral sites. The resultant structure consists of a layered lattice. This same basic structure is found in many other salts and minerals. Cadmium iodide is mostly ionically bonded but with partial covalent character.

Cadmium iodide's crystal structure is the prototype on which the crystal structures many other compounds can be considered to be based. Compounds with any of the following characteristics tend to adopt the CdI2 structure:

Compounds with the CdI2 crystal structure

The iodide anions in CdI2 form a hexagonal close-packed structure, while the cadmium cations occupy some of the octahedral interstices


MgI2, TiI2, VI2, MnI2, FeI2, CoI2, CaI2, PdI2, PbI2.

Chlorides and bromides

TiCl2, VCl2;

MgBr2, TiBr2, VBr2, MnBr2, FeBr2, CoBr2.

Hydroxides of M2+

Mg(OH)2, Ni(OH)2, Ca(OH)2.

Chalcogenides of M4+

TiS2, ZrS2, SnS2, α-TaS2, PtS2;

TiSe2, ZrSe2, SnSe2, PtSe2;

SiTe2, TiTe2, CoTe2, NiTe2, PdTe2, PtTe2.


Ag2F, W2C.


  1. N. N. Greenwood, A. Earnshaw, Chemistry of the Elements, 2nd ed., Butterworth-Heinemann, Oxford, UK, 1997.