 Anhydrous iron ( III ) chloride adopts the <unk> structure , which features octahedral Fe ( III ) centres interconnected by two @-@ coordinate chloride ligands . Iron ( III ) chloride hexahydrate consists of <unk> [ Fe ( H2O ) <unk> ] + cationic complexes and chloride anions , with the remaining two H2O molecules embedded within the monoclinic crystal structure . 
