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

✍ Scribed by Peter Höhn; Rüdiger Kniep

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: German
• Weight: 605 KB
• Volume: 628
• Category: Article
• ISSN: 0372-7874
• DOI: 10.1002/1521-3749(200202)628:2<463::aid-zaac463>3.0.co;2-2

✦ Synopsis

Sr 5 [NbN 4 ]N (transparent, red single crystals) was synthesized by reaction of Sr 2 N 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 ϭ 4, with lattice constants a ϭ 646.6(3) pm, b ϭ 1792.5(9) pm, c ϭ 729.8(4) pm, and R ϭ 0.019, wR 2 ϭ 0.034. The crystal structure contains both isolated tetrahedra [NbN 4 ] 7Ϫ as well as chains of corner sharing octahedra 1 ϱ (Sr 4 Sr 2/2 N 7ϩ ). Strontium is irregularly coordinated by nitrogen Sr 5 [NbN 4 ]N ؊ Ein Nitridoniobat(V)-Nitrid mit isolierten [NbN 4 ] 7؊ -Tetraedern und Oktaederketten 1 ϱ (Sr 4 Sr 2/2 N 7؉ ) Inhaltsübersicht. Sr 5 [NbN 4 ]N wurde durch Umsetzung von Sr 2 N und Nb mit strömendem Stickstoff bei 1223 K in Form transparenter, rotfarbener Einkristalle erhalten. Die Kristallstruktur (Raumgruppe Pbcm (Nr. 57), Z ϭ 4, a ϭ 646.6(3) pm, b ϭ 1792.5(9) pm, c ϭ 729.8(4) pm, R ϭ 0.019, wR 2 ϭ 0.034) enthält isolierte [NbN 4 ] 7Ϫ -Tetraeder und Ketten aus eckenverknüpften Oktaedern