Cadmium iodide

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## Contents

* 1 Overview
* 2 Crystal structure
* 3 Compounds with the CdI2 crystal structure
* 3.1 Iodides
* 3.2 Chlorides and bromides
* 3.3 Hydroxides of M2+
* 3.4 Chalcogenides of M4+
* 3.5 Others
* 4 References

## Overview

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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

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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:

* Iodides of moderately polarising cations; bromides and chlorides of strongly polarising cations
* Hydroxides of dications, i.e. compounds with the general formula M(OH)2
* Sulfides, selenides and tellurides (chalcogenides) of tetracations, i.e. compounds with the general formula MX2, where X = S, Se, Te

## Compounds with the CdI2 crystal structure

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File:Cadmium-iodide-3D-layers.pngThe iodide anions in CdI2 form a hexagonal close-packed structure, while the cadmium cations occupy some of the octahedral interstices

### Iodides

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

### Chlorides and bromides

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TiCl2, VCl2;

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

### Hydroxides of M2+

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

### Chalcogenides of M4+

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TiS2, ZrS2, SnS2, α-TaS2, PtS2;

TiSe2, ZrSe2, SnSe2, PtSe2;

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

### Others

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Ag2F, W2C.

## References

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

de:Cadmium(II)-iodid

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