Zinc iodide

Zinc iodide is an inorganic salt with the formula ZnI₂, composed of zinc and iodide ions. It is used in chemical synthesis and in some battery systems.

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Ionic bonding: Chemical bonding caused by electrostatic attraction between oppositely charged ions. Zinc iodide’s solid structure is held together by attraction between zinc and iodide ions.
Organic synthesis: The construction of organic molecules through chemical reactions. Zinc iodide serves as a Lewis acid catalyst in some organic transformations.
Chemical formula: A notation showing the elements in a substance and their relative numbers. ZnI₂ expresses the one-to-two ratio of zinc to iodine in the compound.
Zinc chloride: An ionic zinc salt with the formula ZnCl₂. It is a more common zinc halide and differs in solubility and chemical reactivity.
Zinc: A metallic chemical element with atomic number 30. Zinc supplies the doubly charged cation in ZnI₂.
Lewis acid: A chemical species that accepts an electron pair to form a bond. Zinc iodide can coordinate to electron-rich groups and activate reactants.
Zinc ion: A positively charged zinc species, commonly Zn²⁺ in aqueous chemistry. The Zn²⁺ ion pairs with iodide to form zinc iodide.
Zinc bromide: An ionic zinc salt with the formula ZnBr₂. Its intermediate halide size provides a close comparison for zinc iodide’s properties.
Iodide: The negatively charged iodine ion, I⁻. Two iodide ions balance the charge of each zinc ion in the formula.
Zinc–iodine battery: A rechargeable battery system that stores energy through zinc and iodine redox chemistry. Zinc iodide can occur in the electrolyte as zinc and iodine species cycle during operation.