Sr4PbPt4O11, the first platinum oxide containing Pt2 ions |
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Authors: | Catherine Renard Pascal Roussel Annick Rubbens Sylvie Daviero-Minaud Francis Abraham |
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Institution: | Unité de Catalyse et de Chimie du Solide, équipe de Chimie du Solide (CNRS UMR 8181) ENSC Lille-UST Lille, BP 90108, 59652 Villeneuve d’Ascq cedex, France |
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Abstract: | We report the synthesis and crystal structure of the new compound Sr4PbPt4O11, containing platinum in highly unusual square pyramidal coordination. The crystals were obtained in molten lead oxide. The structure was solved by X-ray single crystal diffraction techniques on a twinned sample, the final R factors are R=0.0260 and wR=0.0262. The symmetry is triclinic, space group P1¯, with , , , α=90.421(3)°, β=89.773(8)°, γ=90.140(9)° and Z=2. The structure is built from dumbell-shaped Pt2O9 entities formed by a dinuclear metal-metal bonded Pt26+ ion with asymmetric environments of the two Pt atoms, classical PtO4 square plane and unusual PtO5 square pyramid. Successive Pt2O9 entities deduced from 90° rotations are connected through the oxygens of the PtO4 basal squares to form Pt4O108−]∞ columns further connected through Pb2+ and Sr2+ ions. Raman spectroscopy confirmed the peculiar platinum coordination environment. |
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Keywords: | Platinum oxide Pt26+ ion 5-coordinated platinum Crystal structure X-ray diffraction |
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