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  • crystal structure  (5)
  • 2,2,2-Trifluoroethoxy  (1)
  • Aza-tungsta-cyclopropane  (1)
  • Wiley-Blackwell  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Reactions of the “Naked” Fluoride Ion: Syntheses and Structures of SeF62- and BrF6- (1995)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 1 (1995), S. 261-265 
    Details
    ISSN: 0947-6539
    Keywords: crystal structure ; fluorides ; hexafluorobromate(V) ; hexafluoroselenate(IV) ; naked fluoride ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,1,3,3,5,5-Hexamethylpiperidinium fluoride (pip+F-) and 1,2-dimethylpropyltrimethylammonium fluoride have been prepared. They dissolve in fluorohydrocarbons (CH2F2, CF3-CHF-CF3, CHF3) even at very low temperatures. The nature of these solutions is indicated by the crystal structure of the adduct pip+F-·4CH2F2, which shows (C)H…F bridging. The high fluoride activity is exemplified by the previously unknown reaction between SeF5- and F- to yield SeF62-. The salt pip+BrF6- is obtained by a metathesis reaction of Cs+BrF6- with pip+F-. The distortion of the SeF62- structure from octahedral symmetry is intermediate between IF6- (strongly distorted) and BrF6- (octahedral). The electron-pair repulsion model is checked against these results.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19950010410
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  • 2
    Electronic Resource
    Electronic Resource
    Substituted Tungsten Fluorides (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 95-99 
    Details
    ISSN: 1434-1948
    Keywords: Tungsten ; Fluorine ; 2,2,2-Trifluoroethoxy ; Bis(2,2,2-trifluoroethyl)amino ; Aza-tungsta-cyclopropane ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: WF6 reacts with HOCH2CF3 to form F5W-OCH2CF3 and cis-WF4(OCH2CF3)2. CsF is added to F5WOCH2CF3, yielding the heptacoordinated anion [F6WOCH2CF3]-, which has a capped octahedral structure with the oxygen ligand in an equatorial position. The first step of the reaction of WF6 with HN(CH2CF3)2 results in F5WN(CH2CF3)2. Excess HN(CH2CF3)2 causes deprotonation, yielding the heptacoordinated [F5W(η2CF3-CHN-CH2CF3)]- anion. This can be described as a tungstaazacyclopropane derivative or a π complex between F5W- and CF3-CHN-CH2CF3. The only case in which MoF6 reacts similarly is the formation of F5Mo-OCH2CF3.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Cesium Fluoride-Bromine Intercalation Compounds (1996)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 2 (1996), S. 1303-1307 
    Details
    ISSN: 0947-6539
    Keywords: bromine compounds ; cesium compounds ; crystal structure ; fluorides ; intercalation compounds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: CsF reacts with Br2 to form the two intercalation compounds CsF·Br2 and 2CsF·Br2. The former consists of layers of CsF squares separated by layers of Br2 molecules oriented perpendicular to the CsF layers. 2CsF·Br2 is a second-stage compound, composed of two layers of CsF followed by one layer of bromine molecules. Iodine cannot replace bromine; instead, it reacts with CsF to form Cs2I8, and probably CsIF6 between 0° and 120 °C. Chlorine does not react at all with CsF. Bromine reacts with RbF only superficially, and after a long time some RbBr3 is observed; RbF and I2 give RbI3.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19960021018
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  • 4
    Electronic Resource
    Electronic Resource
    Structures of Bromine Oxygen Compounds (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 379-383 
    Details
    ISSN: 0044-2313
    Keywords: Bromine oxygen compounds ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Strukturen von Brom-Sauerstoff VerbindungenDie Kristallstrukturen von Br2O, BrO2F und O2Br—OTeF5 werden beschrieben. Br2O wurde nach einer neuen Methode aus BrOTeF5 und H2O als gelbbrau ner, kristalliner Feststoff erhalten. In der Kristallstruktur (a = 390.4(l), b = 686.2(1), c = 1062.2(2) pm, Raumgruppe Pc21n (Nr. 33), Z = 4) erscheinen gewinkelte (114.2(2)°) Moleküle, die im festen Zustand starke Br … Br Wechsel wirkungen haben, so daß sich eine Kettenstruktur ergibt. BrO2F wurde in bekannter Weise aus KBrO3 und BrF5 her gestellt. Es ist extrem empfindlich gegen. Reduktion. Durch Sublimation erzeugte Einkristalle ergaben eine sechsfache Fehlordnung, die die Sauerstoff- und Fluoratome ununterscheidbar macht (a - ()51.1(2) pm, (α = 47.05(2)°, Raum gruppe R3c, Z = 2). Das BrC2F-Molekül ist pyramidal aufgebaut mit einem durchschnittlichen Bindungswinkel von 103.8(5)°. O2Br-OTeF5 wurde durch Ozonisierung von BrO TeF5 hergestellt und ist ein farbloser Feststoff unterhalb sei ner Schmelz- und Zersetzungstemperatur von -20°C. Es wurde durch Schwingungs- und Kernresonanzspektroskopie und einer Einkristallstrukturanalyse vollständig charakterisiert (a = 517.40(1), b = 614.00(1), c = 1950.70(1) pm, β = 90.61(1)°, Raumgruppe P21/c, Z = 4). Das Molekül hat die erwartete pyramidale Molekülgestalt der BrO3-Gruppe.
    Notes: The crystal structures of Br2O, BrO2F, and O2Br—OTeF5 are reported. Br2O is prepared in a novel manner from BrOTeF5 and H2O, and obtained pure as a yellow brown crystalline solid. The single crystal structure determination a = 390.4(1), b = 686.2(1), c = 1062.2(2) pm, space group Pc21n (No. 33), Z = 4) reveals bent 114.2(2)° Br—O—Br molecules that have strong Br … Br interactions in the solid state resulting in a chain. BrO2F is prepared in the known manner from KBrO3 and BrF5. It is extremely sensitive towards reduction. Crystals obtained by sublimation are rhomboedric with a sixfold disorder making oxygen and fluorine atoms undistinguishable (a = 051.1(2) pm, α = 47.05(2)°, space group R3c, Z = 2). The BrO2F molecular shape is pyramidal with an averaged bond angle of 103.8(3)°. O2Br—O—TeF5 is prepared by ozonisation of Br—O—TeF5 as a colorless solid, mp -20°C. It is fully characterized by vibrational and nmr spetroscopy and a single crystal structure determination (a = 517.40(1), b = 614.00(1), c = 1950.70(1) pm, β= 90.6(1)°, space group P21/c, Z = 4). The molecule has the expected pyramidal geometry at the BrO3 group.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230160
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  • 5
    Electronic Resource
    Electronic Resource
    I—N = S = N—I - Darstellung und Struktur (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 618 (1992), S. 89-92 
    Details
    ISSN: 0044-2313
    Keywords: N,N′-Diiodosulfur diimide ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: I—N = S = N—I, Preparation and ReactivityI—N = S = N—I is prepared form IN[Si(CH3)3]2 by reaction with SF4. It is a shock sensitive yellow powder, that appears in brown crystals after recrystallisation from CH2Cl2. The crystal structure reveals a syn-anti conformation for the molecule. Due to I … N contacts a layer lattice is formed.
    Notes: I—N=S=N—I entsteht aus IN[Si(CH3)3]2 durch Reaktion mit SF4. Es ist ein schlagempfindliches, gelbes Pulver, welches aus CH2Cl2 umkristallisiert in braunen Kristallen anfällt. Die Kristallstruktur zeigt für das Molekül die syn-anti Konformation. Durch I … N Kontakte entsteht ein Schichtengitter.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926180116
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  • 6
    Electronic Resource
    Electronic Resource
    Die Reaktion von Tellurhexafluorid mit Trimethylamin, Strukturen der TeF5-- und SeF5--Anionen (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 618 (1992), S. 83-88 
    Details
    ISSN: 0044-2313
    Keywords: Pentafluoro tellurate(IV) ; pentafluoroselenateIV ; (dimethylamino)-methyl-trimethylammonium cation ; crystal structure ; weak fluorine interactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Telluriumhexafluoride and Trimethylamine, Structures of the TeF5- and SeF5- AnionsThe reaction of TeF6 and (CH3)3N is of the redox kind, resulting in reduction of tellurium: X-ray single crystal analysis reveals the compounds (CH3)2N—CH2—N(CH3)2+TeF5- and [(CH3)3NH+]5(TeF5-)3(HF2-)2. By comparison with published data it can be shown that this mixture is identical to previously published [(CH3)3N]2TeF6. The latter was supposed to be one of the few examples of tellurium in a coordination state of eight. (CH3)4N+TeF5- and (CH3)4N4SeF5- are obtained and their structure is investigated by single crystal x-ray methods also. The anions SF5-, SeF5- and TeF5- are discussed in terms of weak interactions.
    Notes: Die Reaktion von TeF6 mit (CH3)3N ist eine Redoxreaktion, Tellur(VI) wird von Trimethylamin zu Tellur(IV) reduziert: Mittels der Kristallstrukturanalyse werden die Produkte (CH3)2N—CH2-N(CH3)3+TeF5- und [(CH3)3NH+]5(TeF5-)3(HF2-)2 nachgewiesen. Durch Vergleich mit publizierten Daten kann die Existenz von [(CH3)3N]2TeF6 mit achtfach koordiniertem Tellur widerlegt werden. Am (CH3)4N+SeF5- wird erstmals das SeF5--Anion strukturanalytisch und im Vergleich mit SF5- und TeF5- im Hinblick auf schwächere Wechselwirkungen untersucht.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926180115
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