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  • 1
    Electronic Resource
    Electronic Resource
    Bis(pyridinium) Pentachloro(pyridine-N)molybdate(III) (1998)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 736-738 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270198000237
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  • 2
    Electronic Resource
    Electronic Resource
    An Oxomolybdenum(V) Cluster, [Mo8O16(OCH3)8(C5H5N)4] (1998)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 1573-1575 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270198006106
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  • 3
    Electronic Resource
    Electronic Resource
    Tetraphenylphosphonium cis-Tetrabromobis(pyridine)molybdate(III) (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 197-198 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270194007535
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  • 4
    Electronic Resource
    Electronic Resource
    Syntheses and characterization of cis-, trans-m^I[MoCl"4py"2] (M^I = pyH^+,Rb^+,Cs^+,N(CH"3)^+"4,NH"2(CH"3)^+"2, PPh^+"4 and AsPh^+"4; py = pyridine) and the crystal structure of cis-Rb[MoCl"4py"2].H"2O
    Amsterdam : Elsevier
    Polyhedron 13 (1994), S. 3171-3176 
    Details
    ISSN: 0277-5387
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0277-5387(00)83380-X
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  • 5
    Electronic Resource
    Electronic Resource
    Ammonium cis-tetrachlorobispyridinemolybdate(III)–pyridine–water (1/1/0.5) (1994)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 1546-1548 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270194005640
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of cis-Tetrabromobispyridinemolybdates(III) and the crystal structure of cis-(NH4)[MoBr4py2] · ⅓3 H2O (py = pyridine) (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 950-954 
    Details
    ISSN: 0044-2313
    Keywords: Tetrabromobispyridinemolybdates ; preparation ; isomerisation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung von cis-tetrabromobispyridinemolybdaten(III) und die Kristallstruktur von cis-(NH4)[MoBr4py2] · ⅓ H2O (py = Pyridin)(NH4)2[MoBr5 · H2O] reagiert mit Pyridin im Acetonitril (CH3CN) bei Zimmertemperatur. Das Produkt ist ein Gemenge von cis- und trans-(pyH)[MoBr4py2], das auf Grund der Löslichkeitsunterschiede aufgetrennt werden kann. cis-M[MoBr4py2] · ⅓ H2O (M = NH4+, Rb+, Cs+), cis-(bipyH)[MoBr4py2] (bipy = 2,2′-Bipyridyl) und cis-(PPh4)[MoBr4py2] wurden aus cis-(pyH)[MoBr4py2] dargestellt.In siedendem Acetonitril (82°C) erfolgt irreversible cis-trans-Isomerisierung. Brom oxidiert das cis-Diastereoisomere zu trans-MoBr4py2.Die Verbindungen wurden durch chemische Analyse, Infrarot-, UV-VIS-Spektroskopie, Konduktometrie und Röntgen-Pulveraufnahmen charakterisiert.Die Kristallstruktur von cis-(NH4)[MoBr4py2] · ⅓ H2O wurde bestimmt: rhomboedrisch, R3c, (No. 161), a = 15,809(3) Å, β = 112,79(2)°, Z = 6, Dröntg. = 2,29, Dgemess. = 2,27(3) g/cm3, V = 2 601(1) Å3, R1 = 0,046, Rw = 0,068. Die mittleren Mo—Br und Mo—N(Pyridin)-Abstände sind 2,58(2) bzw. 2,20(2) Å. cis-Rb[MoBr4py2] · ⅓ H2O und cis-Cs[MoBr4py2] · ⅓ H2O sind isostrukturell mit cis-(NH4)[MoBr4py2] · ⅓ H2O.
    Notes: The reaction between (NH4)[MoBr5 · H2O] and pyridine in acetonitrile (CH3CN) at room temperature results in the mixture of cis- and trans-(pyH)[MoBr4py2] which can be separated on the basis of solubility. cis-M[MoBr4py2] · ⅓ H2O (M = NH4+, Rb+, Cs+), cis-(bipyH)[MoBr4py2] (bipy = 2,2′-bipyridil) and cis-(PPh4)[MoBr4py2], were prepared from cis-(pyH)[MoBr4py2].At the temperature of boiling acetonitrile irreversible cis to trans isomerisation takes place. Bromine oxydizes cis isomers at room temperature to trans-MoBr4py2.The compounds were characterised by chemical analysis, infrared, UV-VIS spectroscopy, conductivity measurements and powder diffraction.The crystal structure of cis-(NH4)[MoBr4py2] · ⅓ H2O has been determined: rhombohedral, R3c, (No. 161), a = 15.809(3) Å, β = 112.79(2)°, Z = 6, DC = 2.29, DO = 2.27(3) g/cm3, V = 2 601(1) Å3, R1 = 0.046, Rw = 0.068. Average Mo—Br and Mo—N(pyridine) distances within the anion are 2.58(2) and 2.20(2) Å. cis-Rb[MoBr4py2] · ⅓ H2O and cis-Cs[MoBr4py2] · ⅓ H2O are isostructural with cis-(NH4)[MoBr4py2] · ⅓ H2O.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200534
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal structure of trans-pyH[MoBr4py2] and reactivity of Trans-pyH[MBr4py2] (M = Mo, W; py = pyridine) towards nitrogen ligands and bromine Oxidation (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 796-800 
    Details
    ISSN: 0044-2313
    Keywords: Molybdenum / tungsten complexes ; pyridinium molybdenum / tungsten tetrabromine complexes ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kristallstruktur von trans-pyH[MoBr4py2] und die Reaktivität von trans-pyH[MBr4py2] (M = Mo, W; py = Pyridin) gegenüber Stickstoff-Liganden und zur Oxidation mit Brom.Die Kristallstruktur von trans-pyH[MoBr4py2] wurde bestimmt: orthorhombisch, Pnma (No. 62), a = 16,197(3), b = 13,995(3), c = 8,615(1) Å, Z = 4, Dgemess. = 2,20(3), Dröntg. = 2,23 g/cm3, V = 1953(1) Å3. R1, Rw = 0,057 and 0,053. Trans-[MoBr4py2]-, mit der gestaffelten Konformation der Pyridin-Liganden in der Spiegelebene. Mo—Br- und Mo—N(Pyridin)-Abstände sind 2,593(1), 2,573(1), 2,227(8) und 2,213(7) Å. Die Kationen befinden sich in den Symmetriezentren.Das Kation in trans-pyH[MBr4py2] ist ersetzbar; trans-NH4[MBr4py2] · H2O, Cs[MBr4py2], LH[MBr4py2] (M = Mo, W; L = 4-Methylpyridin, 4-pic; 2,2′-Bipyridyl, bipy) wurden dargestellt. Die Molybdän- und Wolfram-Verbindungen analoger Zusammensetzung sind isostrukturell. Alle Stoffe reagieren mit Pyridin und 4-Methyl-pyridin zu trans-MBr3L3 und im Fall des Molybdäns auch zu trans-MoBr3py2(4-pic). Brom oxidiert trans-MI[MBr4py2] zu trans-MBr4py2.
    Notes: The crystal structure of trans-pyH[MoBr4py2] has been determined: orthorhombic, Pnma (No. 62), a = 16.197(3), b = 13.995(3), c = 8.615(1) Å, Z = 4, Dc = 2.23, Do = 2.20(3) g/cm3, V = 1 953(1) Å3. R1, Rw = 0.057 and 0.053. Trans-[MoBr4py2]- anions with staggered conformation of pyridine rings are located on the mirror planes. Mo—Br, Mo—N(pyridine) distances are 2.593(1), 2.573(1), 2.227(8) and 2.213(7) Å. Cations are located on the symmetry centers.The cation in trans-pyH[MBr4py2] can be replaced. Trans-NH4[MBr4py2] · H2O, Cs[MBr4py2], LH[MBr4py2] (M = Mo, W; L = 4-methylpyridine, 4-pic; 2,2′-bipyridyl, bipy) were prepared. The compounds of molybdenum and tungsten with the same chemical composition are isostructural. All compounds react with pyridine and 4-methylpyridine. The products are trans-MBr3L3, and in the case of molybdenum, also trans-MoBr3py2(4-pic). Bromine oxidizes trans-MI[MBr4py2] to trans-MBr4py2.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190427
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