 Anhydrous iron ( III ) chloride adopts the BiI3 structure , which features octahedral Fe ( III ) centres interconnected by two @-@ coordinate chloride ligands . Iron ( III ) chloride hexahydrate consists of trans- [ Fe ( H2O ) 4Cl2 ] + cationic complexes and chloride anions , with the remaining two H2O molecules embedded within the monoclinic crystal structure . 
