Two new \(\mathrm{Fe}^{\mathrm{Ill}}\) and \(\mathrm{V}^{\mathrm{ll}}\) phosphates, \(\mathrm{Ba}_{2} \mathrm{Fe}_{3} \mathrm{H}\left(\mathrm{PO}_{4}\right)_{2}\left(\mathrm{P}_{2} \mathrm{O}_{7}\right)_{2}\) and \(\mathrm{Ba}_{2} \mathrm{~V}_{3} \mathrm{H}_{2}\left(\mathrm{PO}_{4}\right)_{2}\left(\
Hydrothermal Synthesis, Structure, and Magnetic Properties of a Layered Fe(III) Carboxymethylphosphonate: [Fe(H2O)(O3P–CH2–CO2)] or MIL-49
✍ Scribed by Morgane Sanselme; Myriam Riou-Cavellec; Jean-Marc Grenèche; Gérard Férey
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 412 KB
- Volume
- 164
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Fe III (H 2 O)(O 3 P-(CH 2 )-CO 2 )] or MIL-49 was hydrothermally synthesized under autogenous pressure at 1701C for 48 h. Its bidimensional structure was solved from single-crystal X-ray diffraction in the monoclinic space group P2 1 /c (No.14). Cell parameters are a = 9.3836(3) A ˚, b = 6.3798(3) A ˚, c = 10.1371(3) A ˚, b = 111.891(2)1, Z = 4, and V = 563.10(4) A ˚3. Reliability factors of the structure refinement are R 1 (F) = 0.0470 and wR 2 (F 2 ) = 0.1297 for 1036 reflections with I42r(I). The structure of MIL-49 is based on inorganic units built up from two edge-sharing [FeO 5 (H 2 O)] octahedra and two carboxymethylphosphonate groups. The connection of these units leads to the formation of hybrid sheets. A dangling oxygen atom from the carboxy function points toward the interlayer space and is responsible for hydrogen bonding with adjacent layers. Magnetic measurements and 57 Fe Mo¨ssbauer study reveal an antiferromagnetic ordering below T N = 25(1) K which becomes canted below 11(1) K.
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