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Magnetism and 3D Electron Diffraction Solution of Hydrated Rubidium-Ruthenium Oxide Rb2Ru2O7·H2O
Krystof Chrappova1, Jeremiah P Tidey2, Christopher Bell3
1School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.
None:
The crystal structure of Rb2Ru2O7·H2O was determined by three-dimensional electron diffraction from the individual crystallites of a solid-state powder product. Rb2Ru2O7·H2O crystallizes in space group C2/c (a = 7.841(3) Å, b = 12.500(3) Å, c = 8.392(2) Å, β = 93.57(4)°, Z = 4). The structure contains infinite chains that run normal to the (101) plane and consist of alternating RuO6 octahedra and square-pyramidal RuO5 units connected via shared O-O edges. Magnetic properties were measured on the bulk powder, showing a diamagnetic baseline from 300 K to 60 K with a small Curie tail below 55 K. The magnetic moment, calculated from the 1.8 K isotherm, saturates at M = 4.4 × 10-3 μB Ru-1, much less than would be expected for S = 1 ruthenium. Bond-valence-sum analysis indicates high-valent Ru, and the near-diamagnetic response is consistent with the edge-sharing Ru-Ru motif, where weak direct Ru-Ru overlap yields a local singlet.
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