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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 597 (1991), S. 61-67 
    ISSN: 0044-2313
    Keywords: Lithium strontium nitridoniccolate ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Li3Sr3Ni4N4: An Low-Valency Nitridoniccolate with ∞1[NiN]-ChainsIsometric black-reflecting crystals of Li3Sr3Ni4N4 (orthorhombic, Immm; a = 401.1(1) pm, b = 708.8(3) pm, c = 1663.0(8) pm; Z = 2) were obtained by wall-reaction of Li4SrN2 in closed nickel tubes (heating rate 50°C/h; reaction at 800°C for 20 h; cooling rate 10°C/h). The crystal structure contains ∞1[NiN]-chains (Ni—N: 177.3(1) pm and 177.8(1) pm) which run parallel to the [010] direction. Lithium and strontium are arranged in planes (010) perpendicular to the [NiN]-chains and interconnect the chains via the nitrogen atoms. Lithium is in a two-fold (linear; Li—N: 200.7(1) pm and 200.4(7) pm), strontium is in three-and four-fold (distorted trigonal-and square-planar) N-coordination (Sr—N: 264.5(5) pm, 268.0(7) pm and 277.6(6) pm, resp.). Nitrogen is in an octahedral surrounding by Ni, Li and Sr; the coordination-octahedra NNi2Sr4 and NNi2Li3Sr are condensed by sharing common edges and apices. The three-dimensional framework contains one-dimensional fragments of the (inverse) octahedral structures of the ReO3 and Rutile structure types.
    Notes: Isometrische, schwarz-glänzende Einkristalle von Li3Sr3Ni4N4 (orthorhombisch, Immm; a = 401,1(1) pm, b = 708,8(3) pm, c = 1663,0(8) pm; Z = 2) wurden in geschlossenen Nickelampullen durch Reaktion von Li4SrN2 mit dem Tiegelmaterial dargestellt (Aufheizraten 50°C/h; 20 h bei 800°C; Abkühlrate 10°C/h). Die Kristallstruktur enthält parallel [010] verlaufende ∞1[NiN]-Ketten (Ni—N: 177,3(1) pm und 177,8(1) pm). Lithium und Strontium sind in Ebenen (010) senkrecht zu den [NiN]-Ketten angeordnet und verknüpfen diese über die Stickstoffatome. Lithium ist zweifach (linear; Li—N: 200,7(1) pm und 200,4(7) pm), Strontium ist sowohl verzerrt trigonal-planar (Sr—N: 264,5(5) pm und 268,0(7) pm) als auch planar-quadratisch (Sr—N: 277,6(6) pm) von Stickstoff koordiniert. Stickstoff selbst ist oktaedrisch von Ni, Li und Sr umgeben; die Koordinationsoktaeder NNi2Sr4 und NNi2Li3Sr werden über gemeinsame Ecken und Kanten miteinander verknüpft. Der insgesamt dreidimensionale Strukturverband enthält eindimensionale (inverse) Fragmente der Oktaederstrukturen des ReO3- und Rutil-Typs.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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