<P> Ball - and - stick model of part of a layer </P> <Li> <P> Stacking of layers </P> </Li> <P> Stacking of layers </P> <P> Chromium (III) chlorides display the somewhat unusual property of existing in a number of distinct chemical forms (isomers), which differ in terms of the number of chloride anions that are coordinated to Cr (III) and the water of crystallization . The different forms exist both as solids, and in aqueous solutions . Several members are known of the series of (CrCl (H O)). The main hexahydrate can be more precisely described as (CrCl (H O)) Cl 2H O. It consists of the cation trans - (CrCl (H O)) and additional molecules of water and a chloride anion in the lattice . Two other hydrates are known, pale green (CrCl (H O)) Cl H O and violet (Cr (H O)) Cl . Similar behaviour occurs with other chromium (III) compounds . </P>

When chromium chloride crcl2 is dissolved in water