Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1990-1994  (4)
  • crystal structure  (3)
  • Ca3Br2CBN  (1)
  • 1
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Ca3Cl2CBN, eine Verbindung mit dem neuen Anion CBN4- (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 594 (1991), S. 113-118 
    Details
    ISSN: 0044-2313
    Keywords: Ca3Cl2CBN ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ca3Cl2CBN, a Compound with the New CBN4- UnitThe new compound Ca3Cl2CBN was obtained from the reaction of Ca and CaCl2 with CaCN2, B and C or with BN and C, in sealed tantalum containers at 900°C. The crystal structure is related with the structure of Ca3Cl2C3 whereas the C34- units (C2v symmetry) are substituted by isoelectronic CBN4- anions (Cs symmetry): Ca3Cl2CBN, Pnma, a = 1 386.7(9) pm, b = 384.7(3) pm, c = 1 124.7(6) pm, Z = 4; R = 0.055, Rw = 0.036 for 380 independent intensities.The CBN4- units are located between layers of Ca2+ that are interconnected by Cl-. The bond angle (C—B—N) is 176° and bond distances are dC—B = 144 pm and dB—N = 138 pm, respectively.
    Notes: Die neue Verbindung Ca3Cl2CBN bildet sich bei der Reaktion von Ca und CaCl2 mit CaCN2, B und C oder mit BN und C in verschweißten Tantalkapseln bei 900°C. Die Kristallstruktur ist mit der Struktur von Ca3Cl2C3 verwandt, wobei statt den C34--Ionen (C2v-Symmetrie) isoelektronische CBN4--Einheiten (Cs-Symmetrie) vorliegen. Ca3Cl2CBN kristallisiert orthorhombisch (Pnma) mit: a = 1 386,7(9) pm, b = 384,7(3) pm, c = 1 124,7(6) pm, Z = 4; R = 0,055, Rw = 0,036 für 380 unabhängige Intensitäten. Die CBN4--Einheiten liegen zwischen Schichten aus Ca2+, die durch Cl- verbrückt sind. Der Bindungswinkel (C—B—N) beträgt 176°, die Bindungslängen dC—B = 144 pm und dB—N = 138 pm.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915940113
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...