A new conformer of indium germanate InGe3O7.5(en): conformational polymorphism in germanate family.

A new conformer of indium germanate InGe(3)O(7.5)(en) (denoted as δ-type), constructed with the flexible unit of In(2)Ge(6)O(15)N(2) was successfully prepared through a solvothermal method. The crystal data for the δ-type InGe(3)O(7.5)(en) are listed as follows: triclinic, space group P-1 (No.2), a = 7.826(4) Å, b = 8.287(3) Å, c = 9.224(4) Å, α = 71.887(17)°, β = 85.343(18)°, γ = 63.734(12)°, V = 508.64 Å(3), Z = 2. Four relevant conformers of indium germanate are compared with each other. The conformational polymorphism in the germanate family is reported for the first time.