A self-assembled tetrameric water cluster stabilized by the hexachlororhenate(IV) anion and diprotonated 2,2 '-biimidazole: X-ray structure and magnetic properties

A self-assembled tetrameric water cluster stabilized by [ReCl6](2-) anions and [H(4)biim](2+) cations occurs in the new compound [H(4)biim][ReCl6]center dot 4H(2)O, which exhibits a weak ferromagnetic coupling between the Re(IV) centers through an unusual Re-IV-Cl center dot center dot center dot(H2O)center dot center dot center dot Cl-Re-IV pathway.