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Sr5[NbN4]N - A Nitridoniobate(V) Nitride Containing Isolated [NbN4]7- Tetrahedra and Octahedral Chains 1(Sr4Sr2/2N7+)

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Höhn,  P.
Peter Höhn, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kniep,  R.
Rüdiger Kniep, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Höhn, P., & Kniep, R. (2002). Sr5[NbN4]N - A Nitridoniobate(V) Nitride Containing Isolated [NbN4]7- Tetrahedra and Octahedral Chains 1(Sr4Sr2/2N7+). Zeitschrift für Anorganische und Allgemeine Chemie, 628(2), 463-467. doi:10.1002/1521-3749(200202)628:2<463:AID-ZAAC463>3.0.CO;2-2.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-31AF-2
Abstract
Sr-5[NbN4]N (transparent, red single crystals) was synthesized by reaction of Sr2N with Nb under nitrogen at ambient pressure and 1223 K. The crystal structure was solved and refined in the space group Pbcm (no. 57), Z = 4, with lattice constants a = 646.6(3) pm, b = 1792.5(9) pm, c = 729.8(4) pm, and R = 0.019, wR2 = 0.034. The crystal structure contains both isolated tetrahedra [NbN4](7-) as well as chains of corner sharing octahedra (1)(infinity)(Sr4Sr2/2N7+). Strontium is irregularly coordinated by nitrogen (CN = 4 - 6, Sr-N: 252.3(4) - 340.8(3) pm); nitrogen is located in a distorted octahedral environment by strontium and niobium (Nb-N: 194.5(4) - 199.2(2) pin). By formal reduction of the structural building units to their centers a close structural relationship to both the NiAs and the CaSi type structure is evident.