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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and structure of the novel chain compound niobium iodide sulfide (Nb6I9S) and its hydride (1991)
    s.l. : American Chemical Society
    Inorganic chemistry 30 (1991), S. 963-967 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00005a017
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  • 2
    Electronic Resource
    Electronic Resource
    Distortions in the structure of calcium carbide: a theoretical investigation (1992)
    s.l. : American Chemical Society
    Inorganic chemistry 31 (1992), S. 1734-1740 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00036a003
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  • 3
    Electronic Resource
    Electronic Resource
    Theoretical study of the electronic properties of niobium iodide sulfide (Nb6I9S) and its hydride (Nb6(H)I9S) (1992)
    s.l. : American Chemical Society
    Inorganic chemistry 31 (1992), S. 4276-4280 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00047a013
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  • 4
    Electronic Resource
    Electronic Resource
    Unusual valences in rare-earth halides (1992)
    s.l. : American Chemical Society
    Chemistry of materials 4 (1992), S. 1157-1168 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00024a012
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  • 5
    Electronic Resource
    Electronic Resource
    Rb3[Nb6SBr17], die erste Verbindung mit einem isolierten trigonal-prismatischen NiobclusterDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert. Herrn Prof. Dr. G. Meyer danken wir für die Bereitstellung von Institutsmitteln. (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 106 (1994), S. 2022-2023 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19941061909
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Über ein Oxidchlorid des Calciums: Ca4OCl6 (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 596 (1991), S. 89-92 
    Details
    ISSN: 0044-2313
    Keywords: Calcium oxychloride ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: An Oxychloride of Calcium: Ca4OCl6Ca4OCl6 (hexagonal, P63mc, Z = 2), a = 905.8(3), c = 686.3(4) pm, (R = 0.031) crystallizes as colourless needles from reducing melts (CaCl2, Ca) that contain small amounts of „oxygen“. It contains „isolated“ tetrahedral units [Ca4O] and is isotypic with e.g., Ba4OCl6, Yb4OCl6 and K6HgS4. Ca4OCl6 does not form in the dehydration process of, for example, CaCl2 · 6 H2O.
    Notes: Ca4OCl6 (hexagonal, P63mc, Z = 2, a = 905.8(3)); c = 686.3(4) pm, (R = 0,031) kristallisiert in Form farbloser Nadeln aus „reduzierenden Schmelzen“ (CaCl2, Ca), die wenig „Sauerstoff“ enthalten. Es enthält „isolierte“ tetraedrische [Ca4O]-Einheiten und ist isotyp mit z. B. Ba4OCl6, Yb4OCl6 oder K6HgS4. Ca4OCl6 entsteht nicht beim Entwässern von z. B. CaCl2 · 6 H2O.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915960112
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  • 8
    Electronic Resource
    Electronic Resource
    Die Elektronische Struktur von Nb3Br8 (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 81-84 
    Details
    ISSN: 0044-2313
    Keywords: Nb3Br8 ; electronic structure ; molecular orbitals ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Electronic Structure of Nb3Br8The bonding in Nb3Br8 was investigated with the aid of extended Hückel and molecular orbital calculations to gain some understanding concerning stability and possible chemical altering. Seven electrons occupy metal - metal bonding states of a Nb3Br8 unit. Six of them are responsible for strong σ bonds within the Nb3 cluster. One to two additional electrons may be incorporated to occupy a1 orbitals, which slightly increase the bonding in a Nb3 cluster, rather than between adjacent clusters.
    Notes: Die Bindungsverhältnisse in Nb3Br8 werden mittels Extended-Hückel- und Molekülorbital-Rechnungen untersucht, um hieraus Hinweise auf die Stabilität und mögliche chemische Modifizierbarkeit zu erhalten. Sieben Elektronen sind den Metall - Metall-bindenden Zuständen einer Nb3Br8-Einheit zuzurechnen. Sechs davon sind für starke σ-Bindungen in den Nb3-Clustern verantwortlich. Ein bis zwei zusätzliche Elektronen können in den a1-Orbitalen untergebracht werden, die sich innerhalb eines Nb3-Clusters schwach bindungsverstärkend auswirken, nicht aber zwischen benachbarten Clustern.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200113
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  • 9
    Electronic Resource
    Electronic Resource
    CsNb3Br7S: Synthese, Struktur und Bindungsverhältnisse (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 863-866 
    Details
    ISSN: 0044-2313
    Keywords: CsNb3Br7S ; synthesis ; crystal structure ; bonding ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: CsNb3Br7S: Synthesis, Structure, and Bonding StatesThe reaction of NbBr5 with Nb, Cs and S in a sealed Nb container affords CsNb3Br7S at 800°C (3 days). Further on isotypic compounds of the general formula ANb3X7Ch with A = Rb, Cs; X = Cl, Br and Ch = S, Se are obtained. CsNb3Br7S crystallizes monoclinic (space group P21/a, Z = 2), with the lattice parameters a = 707.4(2), b = 1 888.4(4), c = 994.1(2) pm and β = 98.59(2)°. The crystal structure contains Nb3 clusters being linked by two additional Nb—Nb bonds to form infinite chains. Adjacent chains are bridged by Cs atoms in a cubeoctahedral coordination sphere of Br atoms. Similar with Nb3Br8 seven electrons occupy metal - metal bonding states.
    Notes: Bei der Reaktion von NbBr5 mit Nb, Cs und S bildet sich im verschweißten Niobrohr bei 800°C (3 Tage) CsNb3Br7S. Ferner wurden isotype Verbindungen der allgemeinen Zusammensetzung ANb3X7Ch mit A = Rb, Cs; X = Cl, Br und Ch = S, Se erhalten. CsNb3Br7S kristallisiert monoklin (Raumgruppe P21/a, Z = 2) mit den Gitterparametern a = 707,4(2), b = 1 888,4(4), c = 994,1(2) pm und β = 98,59(2)°. In der Kristallstruktur liegen Nb3-Cluster vor, die durch zwei zusätzliche Nb—Nb-Bindungen zu unendlichen Strängen verknüpft sind. Cs-Atome verbrücken benachbarte Stränge und besitzen eine kuboktaedrische Koordinationssphäre aus Br-Atomen. Wie in Nb3Br8 besetzen formal sieben Elektronen Metall - Metall-bindende Zustände.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200519
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  • 10
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur eines Calciumcarbidchlorides mit einer C34--Einheit, Ca3Cl2C3 (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 593 (1991), S. 185-192 
    Details
    ISSN: 0044-2313
    Keywords: Calciumcarbide Chloride ; Synthesis ; Crystal Structure ; Allylenide Ion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of a Calciumcarbide Chloride Containing a C34- Unit, Ca3Cl2C3Ca3Cl2C3 was prepared from calcium, CaCl2 and graphite in sealed tantalum capsules. Red, transparent crystals were obtained from heating the mixture to 900°C (for one day) and annealing afterwards at 780°C for three days. The compound forms a layered structure (Cmcm, Z = 4, a = 384.24(9) pm, b = 1340.7(3) pm, c = 1152.6(3) pm, R = RW = 0.036 for 481 independent intensities) with alternating stacks of double layers of Ca2+ and monolayers of Cl-. The double layers of calcium contain allylenide ions, C34-. The latter exhibit C2v symmetry, a bond angle (C—C—C) of 169.0(6)° and a C—C separation of 134.6(4) pm.
    Notes: Ca3Cl2C3 entsteht aus Calcium, CaCl2 und Graphit in verschweißten Tantal-Kapseln in Form roter, transparenter Kristalle durch Erhitzen des Reaktionsgemenges auf 900°C (1 Tag) und anschließendes dreitägiges Tempern bei 780°C. Die Verbindung kristallisiert in einer Schichtstruktur (Cmcm, Z = 4, a = 384,24(9) pm, b = 1 340,7(3) pm, c = 1 152,6(3) pm, R = RW = 0,036 für 481 unabhängige Intensitäten) mit einer alternierenden Anordnung von Doppelschichten aus Ca2+ und Schichten aus Cl-. In den Calcium-Doppelschichten liegen die Allylenidionen, C34-. Sie zeigen C2v-Symmetrie mit einem Bindungswinkel (C—C—C) von 169,0(6)° und dem C—C-Bindungsabstand von 134,6(4) pm.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915930118
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