As indicated in the table below, many hydrates of metal chlorides are molecular complexes.  These compounds are often important commercial sources of transition metal chlorides.  Several hydrated metal chlorides are not molecular  and thus are not included in this tabulation.  For example the dihydrates of manganese(II) chloride, nickel(II) chloride, copper(II) chloride, iron(II) chloride, and cobalt(II) chloride are coordination polymers.