A low-temperature investigation of trans-diiodo­tetra­kis(tetra­hydro­furan)calcium(II)

The asymmetric unit of the title compound, [CaI₂(C₄H₈O)₄], at 100 K comprises half each of two independent mol­ecules, each of which is located on a center of inversion, and in each of these, the central Ca atom is bound by two trans I atoms and four tetra­hydro­furan mol­ecules to give a distorted octa­hedral geometry. This compound undergoes a phase change on cooling from room temperature to 100 K, altering the space group from monoclinic P2₁/c to triclinic P. This change is also accompanied by a reduction in the positional disorder of the coordinated tetra­hydro­furan mol­ecules.