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Ba5[CrN4]N: Das erste Nitridochromat(V)

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Tennstedt, A., Kniep, R., Hüber, M., & Haase, W. (1995). Ba5[CrN4]N: Das erste Nitridochromat(V). Zeitschrift für anorganische und allgemeine Chemie, 621(4), 511-515. doi:10.1002/zaac.19956210402.

Ba-5[CrN4]N is prepared by reaction of mixtures of Li3N, Ba3N2 and CrN/Cr2N (1:1) (molar ratio Li:Ba:Cr = 3:5:1) in tantalum crucibles at 700 degrees C with flowing nitrogen (1 atm) within a period of 48 h. After cooling down to room temperature (60 degrees C/h) black-shining single crystals of the ternary phase with a platy habit are obtained (monoclinic, C2/m; a = 1054.0(2)pm, b = 1170.9(3)pm, c = 937.7(2)pm beta = 110,79(2)degrees; Z = 4). The crystal structure contains isolated complex anions [(CrN4)-N-v](7-) which nearly satisfy the ideal tetrahedral symmetry (Cr-N [pm]: 2 x 175.3(4), 2 x 175.8(5); NCr-N-N [degrees]: 106.8(2), 109.5(2), 2 x 109.9(2), 2 x 110,3(2)). The coordination sphere for each of the terminal nitride functions of the complex anions is completed by five neighbouring Ba2+ ions (distorted CrBa5 octahedra). The octahedra are connected via common CrBa2 faces as well as CrBa edges thereby forming condensed tetrameric octahedral groups. The isolated nitride ions which are also present in the crystal structure of Ba-5[CrN4]N are in an octahedral environment of Ba2+ ions. The presence of a d(1)-System (Cr(V)) is confirmed by magnetic susceptibility data.