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A new three-dimensional iron (III) dicarboxylate, MIL-85 or Fe III 2 OO 2 C−CH 3 2 O 2 C−C 6 H 4 −CO 2 ·2CH 3 OH, has been obtained under solvothermal conditions, and its structure was determined using X-ray powder diffraction data. Its chiral framework is built up from helical chains of iron (III) octahedra linked through terephthalate dianions. This creates a three-dimensional structure with an array of 1-D small-pore channels filled with free and bound methanol moieties. The thermal behavior has been investigated using TGA, and X-ray thermodiffractometry indicates that MIL-85 is stable up to 275 °C with a fully reversible departure of solvent process. When the free and bound solvent molecules are removed, a nanoporous solid with a Langmuir surface area of 110 m 2 /g is obtained. Mössbauer spectrometry confirms the presence of high-spin-state Fe 3+ within the structure and a change in the iron environment upon solvent departure. Finally, one can conclude from magnetic data that MIL-85 exhibits a frustrated magnetic behavior in the low-temperature range. Crystal data for MIL-85: hexagonal space group P 6 1 (nο. 169) with a = 11. 045 (1) Å, c = 18. 823 (1) Å, and Z = 6.
Serre et al. (Fri,) studied this question.