Crystallographic and Magnetic Studies of an Unusual Mo3 O13 Cluster Compound, Na2 In2 Mo5 O16

B. T. Collins, S. M. Fine, J. A. Potenza, P. P. Tsai, M. Greenblatt

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Highly reflective, black, hexagonal platelike crystals of Na2 In2 Mo5016 were prepared by fused-salt electrolysis at 600 °C of a melt containing Na2 Mo04, Mo03, and ln2 O3. The compound crystallizes in the trigonal space group P3m1 with a = 5.7856 (8) Å, c = 11.266 (1) A, V = 326.6 (2) Å3,Z = 1, RF= 3.5%, and RwF= 3.7% for 1111 unique reflections with Fo2≥ 3σ(Fo2). The structure of Na2 In2 Mo5 O16 can be described as “layers” of indium and molybdenum oxygen polyhedra (in the ab plane) located at different values along the c axis. Planes of edge-sharing triangular Mo3 O13 cluster units with intra- and intercluster Mo-Mo distances of 2.6164 (5) and 3.1691 (5) A, respectively, are separated by individual layers of In06 octahedra and M oo4tetrahedra. Each InO6 octahedral and MoO4 tetrahedral layer contains a trigonal array of the respective polyhedra. The stacking sequence (at different values of z) of the individual layers is Mo3 O13 cluster, InO6, MoO4, MoO4, InO6, and Mo3 O13 cluster. The sodium ions are in large cavities created by the In-Mo-O network. One sodium ion has trigonal-antiprismatic coordination and lies on a fully occupied site, whereas the two other Na ions are 10-coordinate and are situated on sites with occupancies of 42 (2) and 62 (2)%, respectively. Magnetic susceptibility measurements indicate temperature-independent paramagnetic behavior.

Original languageEnglish (US)
Pages (from-to)2444-2447
Number of pages4
JournalInorganic Chemistry
Issue number12
StatePublished - Jun 1 1989

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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