CRYSTAL-STRUCTURE OF THE ORTHORHOMBIC MIXED-VALENCE OXIDE TEMO5O16

Single crystals of TeMo5O16 have been prepared from powder mixtures by cooling from 1,370 K down to 370 K. The structure was determined from the data collected by an automatic diffractometer. The unit cell is orthorhombic with space group Pm2a, a = 20.010 (1), b = 4.0650 (2), c = 7.2254 (4) angstrom, Z = 2. The three-dimensional framework is built up from corner-sharing [MoO6] octahedra. [Te-O] infinity chains extend along wide hexagonal tunnels. Te(IV) is four-coordinated with oxygen atoms and the lone pair completes the trigonal [TeO4E] bipyramid.