A new conformer of indium germanate InGe3O7.5(en) (denoted as δ-type), constructed with the flexible unit of In2Ge6O15N2 was successfully prepared through a solvothermal method. The crystal data for the δ-type InGe3O7.5(en) are listed as follows: triclinic, space groupP-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 Å3, 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.
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