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  • 1
    Electronic Resource
    Electronic Resource
    Über die Synthese von Erdalkalimetalldihalogeniden und die Strukturen von Ca3Br2CBN und Sr3Cl2CBN (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 258-261 
    Details
    ISSN: 0044-2313
    Keywords: alkaline-earth dihalides ; Ca3Br2CBN ; Sr3Cl2CBN ; preparation ; structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Synthesis of Alkaline-Earth Dihalides and the Structures of Ca3Br2CBN and Sr3Cl2CBNThe reaction of alkaline-earth carbonates with ammonium chloride or bromide yields alkaline-earth dihalides at relatively low temperatures (300°C). Ca3Br2CBN and Sr3Cl2CBN were synthesized in sealed niobium containers at 950°C from the metal, its dihalide, boron nitride and graphite. The crystal structure of Sr3Cl2CBN was refined from single crystal data. Sr3Cl2CBN crystallizes isotypic with Ca3Cl2CBN in the orthorhombic space group Pnma (No. 62) with a = 1448.4(2) pm b = 405.46(5) pm, c = 1170.0(1) pm. The lattice constants of Ca3Br2CBN and Sr3Cl2CBN were determined by orthorhombic indexing of the powder patterns (Ca3Br2CBN: a = 1444.3(2) pm, b = 390.64(6) pm, c = 1139.2(2) pm; Sr3Cl2CBN: a = 1444.0(4) pm, b = 405.27(8) pm, c = 1167.8(2) pm). There was no success in preparing homologues with Barium.
    Notes: Die Umsetzung von Erdalkalimetallcarbonaten mit Ammoniumchlorid oder Ammoniumbromid liefert bei relativ niedrigen Temperaturen (300°C) Erdalkalimetalldihalogenide. Ca3Br2CBN und Sr3Cl2CBN wurden in verschweißten Niobcontainern bei 950°C aus dem Metall, dessen Dihalogenid sowie Bornitrid und Graphit hergestellt. Die Kristallstruktur von Sr3Cl2CBN wurde mit Einkristalldaten verfeinert. Sr3Cl2CBN kristallisiert isotyp zu Ca3Cl2CBN in der orthorhombischen Raumgruppe Pnma (Nr. 62) mit a = 1448,4(2) pm, b = 405,46(5) pm, c = 1170,1(1) pm. Die Gitterkonstanten von Ca3Br2CBN und Sr3Cl2CBN wurden durch orthorhombische Indizierung der Pulverdiagramme bestimmt (Ca3Br2CBN: a = 1444,3(2) pm, b = 390,64(6) pm, c = 1139,2(2) pm; Sr3Cl2CBN: a = 1444,0(4) pm, b = 405,27(8) pm, c = 1167,8(2) pm). Es gelang nicht, Barium-homologe darzustellen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200209
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Struktur von Sr3(BN2)2 (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 262-265 
    Details
    ISSN: 0044-2313
    Keywords: Ca3(BN2)2 ; Sr3(BN2)2 ; NaSr4(BN2)3 ; preparation ; structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of Sr3(BN2)2The structure of Sr3(BN2)2 was determined on single-crystal X-ray data collected with a four-circle diffractometer. Sr3(BN2)2 crystallizes in the cubic space group Im3m (no. 229) with a = 764.56(3) pm and Z = 3. The structure contains linear BN3-2 ions with a B—N bond length of 135.8(6) pm. The straight forward synthesis employing metal nitrides plus boron nitride yielded crystalline powders of M3(BN2)2 (M = Ca, Sr) at 1100°C (5 days). Cubic indexing of guinier patterns gave a = 765.8(1) pm for M = Sr and a = 734.7(2) pm for M = Ca. The structure refinement on a single crystal of Sr3(BN2)2 revealed that one strontium site (2a; 0, 0, 0) is occupied by only about 50%. It has been tried to fully occupy this site with an alkali metal (A) to obtain ASr4(BN2)3 (Z = 2). Reactions with A = Na yielded crystalline powders. Cubic indexing of the guinier pattern analogous to that of Sr3(BN2)2 gave a = 754.2(1) pm.
    Notes: Die Struktur von Sr3(BN2)2 wurde anhand von Einkristall-Röntgendaten, die durch Messung an einem Vierkreisdiffraktometer erhalten wurden, bestimmt. Sr3(BN2)2 kristallisiert in der kubischen Raumgruppe Im3m (Nr. 229) mit a = 764,56(3) pm und Z = 3. Die Struktur enthält lineare BN3-2-Ionen mit einer Bindungslänge B—N von 135,8(6) pm. Die gezielte Darstellung aus den Metallnitriden und Bornitrid zu M3(BN2)2 (M = Ca, Sr) bei 1100°C (5 Tage) ergab kristalline Pulver. Kubische Indizierung der Guinierdiagramme gab a = 765,8(1) pm für M = Sr und 734,7(2) pm für M = Ca. Die Strukturverfeinerung an einem Einkristall von Sr3(BN2)2 zeigte, daß eine Strontiumlage (2a; 0,0,0) nur zu etwa 50% besetzt ist. Es wurde versucht, diese Lage mit einem Alkalimetall (A) entsprechend ASr4(BN2)3 (Z = 2) vollständig zu besetzen. Reaktionen mit A = Na ergaben kristalline Pulver, deren Guinierdiagramme analog zu Sr3(BN2)2 kubisch mit a = 754,2(1) pm indiziert werden konnten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200210
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    Paper (German National Licenses)
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