Crystal Structure of Ferric Chloride Hexahydrate

摘要

The crystal structure of ferric chloride hexahydrate has been determined from threehyphen;dimensional singlehyphen;crystal xhyphen;rayhyphen;diffraction data. In the crystals two chloride ions and four water molecules are arranged around each ferric ion to form octahedraltranshyphen;FeCl2(OH2)4+ions withC2hminus;2/msymmetry. Fesngbnd;Cl and Fesngbnd;OH2interatomic distances in the complex ion are 2.30plusmn;0.02 Aring; and 2.07plusmn;0.02 Aring;, respectively. The crystals are monoclinic, space groupC2h3mdash;C2/m, witha=11.89plusmn;0.02,b=7.05plusmn;0.01,c=5.99plusmn;0.01 Aring;, and bgr;=100.5plusmn;0.2deg;. The unit cell contains two FeCl2(OH2)4Clmiddot;2H2O units. The arrangement of the FeCl2(OH2)4+ions, chloride ions, and water molecules in the crystals indicates hydrogen bonding in addition to the electrostatic forces between oppositely charged ions.