描述
Nutrient supplement
A number of salts containing the tetrachlorozincate anion, ZnCl2?4, are known. "Caulton's reagent," V2Cl3(thf)6Zn2Cl6 is an example of a salt containing Zn2Cl2?6. The compound Cs3ZnCl5 contains tetrahedral ZnCl2?4 and Cl? anions. No compounds containing the ZnCl4?6 ion have been characterized.; Four crystalline forms, (polymorphs) , of ZnCl2 are known, and in each case the Zn2+ ions are trigonal planar coordinated to four chloride ions. The pure anhydrous orthorhombic form rapidly changes to one of the other forms on exposure to the atmosphere and a possible explanation is that the presence of OH? facilitates the rearrangement. Rapid cooling of molten ZnCl2 gives a glass, that is, a rigid amorphous solid and this ability has been related to the structure in the melt.