I vandig opløsning er følgende blevet observeret, oktahedral  Zn(H<sub>2</sub>O)<sub>6</sub><sup>2+</sup>, [ZnI(H<sub>2</sub>O)<sub>5</sub>]<sup>+</sup> og tetrahedral ZnI<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>, ZnI<sub>3</sub>(H<sub>2</sub>O)<sup>−</sup> og ZnI<sub>4</sub><sup>2−</sup>.<ref>{{cite journal | author = Wakita, H.; Johansson, G.; Sandström, M.; Goggin, P. L.; Ohtaki, H. | title = Structure determination of zinc iodide complexes formed in aqueous solution | journal = Journal of Solution Chemistry | year = 1991 | volume = 20 | issue = 7 | pages = 643–668 | doi = 10.1007/BF00650714 }}</ref>
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