(Ba₆O)(ReN₃)₂: Synthesis, crystal structure and physical properties

Carsten Schmidt (1) , Robert Dinnebier (1) , Martin Jansen (1)

1 Max-Planck-Institut für Festkörperforschung

Reacting mixture of Ba and Re (3:1) at 850 °C under flowing nitrogen has yielded the nitride-oxide (Ba₆O)(ReN₃)₂ ( R3 (No. 148); a = 8.1178(2) Å, c = 17.5651(4) Å; V = 1002.43(5) ų; Z = 6). According to a structure refinement on X-ray powder data, this compound is isostructural to a recently described nitride-oxide of osmium of analogous composition. The structure consists of sheets of trigonal ReN₃ units and trigonal antiprismatic Ba₆O groups. The Ba-O distance of 2.73 Å is close to the sum of the respective ionic radii. The trigonal ReN₃^5- nitride anion displays a Re-N bond length of 1.94 Ả, and is planar within the limits of experimental error. The constitution of the anion was confirmed by IR and Raman spectroscopy. The nitride-oxide is stable up to 1000 °C, semiconducting (σ= 4.57*10^-3 Ω^-1cm^-1 at RT), and paramagnetic down to 25 K. A Curie-Weiss analysis resulted in a magnetic moment of μ = 0.68 μ_B per rhenium atom.

Mots clés: Physical Sciences

Carsten Schmidt, Robert Dinnebier, Martin Jansen. (Ba₆O)(ReN₃)₂: Synthesis, crystal structure and physical properties. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2010, 636 (15), pp.2529. ⟨10.1002/zaac.201000293⟩. ⟨hal-00599886⟩