La5Mo6O21: a novel ternary reduced molybdenum oxide containing {MoIV}3 clusters and isolated MoV centres.
The crystal structure of La5Mo6O21 (pentalanthanum hexamolybdenum henicosaoxide) is made up of Mo3O13 units containing triangular {MoIV}3 clusters, three distorted MoVO6 octahedral units and six interstitial LaIII atoms. The Mo3O13 unit consists of three edge-sharing MoIVO6 units involving Mo-Mo bonding. The three MoVO6 octahedra share their corners or edges with each other and with the Mo3O13 units.
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Laboratoire de Chimie du Solide et Inorganique Moléculaire, UMR-CNRS No. 6511, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cedex, France.
Gougeon
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