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  • 1995-1999  (11)
  • 1975-1979  (4)
  • 1996  (11)
  • 1979  (4)
  • Chemistry  (15)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 997-1001 
    ISSN: 0009-2940
    Keywords: Ionic ozonides ; Ammonium ion, bisquaternary ; C-H…O hydrogen bonds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bisquaternary ammonium ozonides Me3N+(CH2)n +NMe3(O3-)2 with n = 3, 4, 6 (1, 2, 3), Me3N+(CH2)3+NMe3(O3-)2 · 3 NH3 (1a), Me3N+(p-Ph)+NMe3(O3-)2 (4) and Me3N+(p-Ph)+NMe3(O3-)2 · NH3 (4a) were obtained in quantitative yields by cation exchange starting from CsO3. The compounds 1a and 3 have been studied by single crystal X-ray analysis. The influence of C-H…O and N-H…O hydrogen bonds on the bond length and the bond angle of the ozonide anion is discussed; earlier results are included. The difference between the two bond lengths within the O3- ion [137.4(3) pm and 129.5(3) pm] in 1a is unexpectedly large. Thermal stabilities determined by DTA/TG methods range from 24-83°C.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 121-124 
    ISSN: 0009-2940
    Keywords: N-Organyl tetraphosphorus hexaoxide ; Cage redistribution ; Nitrene insertion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of tetraphosphorus hexaoxide with organic azides leads selectively to the cage redistribution products 1 P4O6NPh, 2 P4O6NC2H4Ph, 3 P4O6NSO2CH3, 4 P4O6NC6H13, and 5 P4O6NCO2C2H5 by nitrene insertion. The molecular structure consists of an adamantane-like P4O5N cage with a terminally bound oxygen atom. The P4O5N cagelike structure is confirmed by 31P NMR spectroscopy and X-ray structure analysis. The P4O5N cages of the P4O6NR molecules possess a significant geometrical distortion.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-2940
    Keywords: Ozonides ; Sodium ozonide ; Lithium ozonide ; Cation exchange ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Concentrated solutions of the ozonides LiO3 and NaO3 in anhydrous liquid ammonia were obtained for the first time by using an ion exchange reaction that starts from CsO3. No solid LiO3 or NaO3 can be precipitated. Upon removal of the solvent, the ozonide anion oxidises ammonia, resulting in the precipitation of LiOH and NaOH, respectively. This behaviour is in sharp contrast to that of solutions of KO3, RbO3 and CsO3. Proof of the existence of LiO3 and NaO3 in the solutions is provided by complexation of the cations with cryptands, which leads to solid (Li[2.1.1])O3 and (Na[2.2.2])O3. Crystal structure analysis shows that these are ionic solids containing the V-shaped O3- anion.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 91 (1979), S. 500-500 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 91 (1979), S. 762-762 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 108 (1996), S. 1358-1377 
    ISSN: 0044-8249
    Keywords: Computerchemie ; Festkörperstrukturen ; Strukturvorhersage ; Syntheseplanung ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Wir stellen hier eine Methode vor, mit der im Prinzip die Existenz und Struktur von (meta)stabilen Festkörperverbindungen vorhergesagt werden kann. Sie beruht auf der Erkundung der Energiefunktion des betrachteten chemischen Systems mit Verfahren, die zunächst eine globale und schließlich eine lokale Optimierung ermöglichen. Das hierfür entwickelte Programmsystem ist modular aufgebaut. Die Hauptelemente sind eine Reihe von Routinen für globale und lokale Minimierungen sowie Algorithmen zur Untersuchung der Phasenraumstruktur in der Nähe lokaler Minima der potentiellen Energie und zur Analyse und Charakterisierung der Strukturkandidaten. Derzeit behandeln wir damit ionische Verbindungen, wobei die Energiefunktion zunächst mit Hilfe empirischer Potentiale berechnet wird und danach die Ergebnisse mit einem Hartree-Fock-Algorithmus verfeinert werden. Die globale Optimierung erfolgt mit einem stochastischen «Simulated-Annealing»-Algorithmus, die lokale Minimierung verwendet einen stochastischen «Quench» oder ein Gradientenverfahren. Die Umgebungen der lokalen Minima werden mit dem «Threshold»-Algorithmus untersucht. Wir zeigen Ergebnisse dieses Ansatzes an binären Mischphasen der Edelgase sowie an binären und ternären ionischen Systemen. Diese schließen einige bislang noch nicht synthetisierte Substanzen ein, die jedoch kinetisch stabil sein sollten, z.B. weitere Alkalimetallnitride neben Li3N sowie Ca3SiBr2 und SrTi2O5.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0044-8249
    Keywords: Natriumverbindungen ; Stickstoffverbindungen ; Strukturaufklärung ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 167-172 
    ISSN: 0044-2313
    Keywords: Iodine trioxide ; crystal structure ; Raman ; IR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Crystal Growth, and Crystal Structure Determination of Iodine TrioxideFor the first time, pure and single crystalline iodine trioxide has been obtained and its identity proven by a crystal structure determination, unambigously. It forms at slow decomposition of orthoperiodic acid in concentrated sulfuric acid at 70°C during 3-6 weeks. The crystal structure (triclinic, P1; a = 500.6(2), b = 674.1(3), c = 679.5(3) pm, α = 97.31(3), β = 96.43(3), γ = 105.36(3)°; 1754 independent reflections, R = 0.064) contains one I4O12 molecule per unit cell. The oxide can be regarded as a mixed anhydride formed by condensation of two molecules H5IO6 and HIO3, each. The axial atoms in an I2O10 doubleoctahedron are bridged by two IO groups. The pointsymmetry is C2h. The molecules are connected via short intermolecular oxygen iodine bridges to form twodimensional infinite layers. The crystal structure thus represents an intermediate between molecular and polymeric.
    Notes: Erstmals wurde Jodtrioxid in reiner und einkristalliner Form erhalten und seine Identität durch Röntgenstrukturanalyse eindeutig belegt. Es bildet sich bei langsamer Zersetzung von Orthoperiodsäure in konzentrierter Schwefelsäure bei 70°C im Verlaufe von 3-6 Wochen. In der Kristallstruktur (triklin, P1; a = 500,6(2), b = 674,1(3), c = 679,5(3) pm, α = 97,31(3), β = 96,43(3), γ = 105,36(3)°; 1754 unabhängige Reflexe, R = 0,064) liegt pro Elementarzelle ein I4O12-Molekül vor, das als gemischtes Anhydrid aus je zwei Molekülen H5IO6 und HIO3 aufgefaßt werden kann. Die axialen O-Atome in einem I2O10-Doppeloktaeder werden von IO-Gruppen verbrückt. Die Punktsymmetrie ist C2h. Die Moleküle werden über relativ kurze intermolekulare Sauerstoff-Iod-Brücken untereinander zu zweidimensional unendlichen Schichten verknüpft; die Kristallstruktur weist also eine hybride Natur zwischen Molekülkristall und kollektivem Festkörper auf.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1901-1906 
    ISSN: 0044-2313
    Keywords: Tetrahydrogen mesoperiodate ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Li2H4I2O10, the First TetrahydrogendimesoperiodateLi2H4I2O10 has been obtained as an intermediate during the dehydration of LiH4IO6 · H2O to LiIO4, for the first time. According to the results of an X-ray structure determination (monoclinic, P21/n, a = 533.98(4), b = 471.85(4), c = 1431.48(10) pm, β = 91.614(7)°, Z = 2, 726 diffractometer data, R = 0.056), Li2H4I2O10 contains the previously unknown tetrahydrogendimesoperiodate ion H4I2O102-, consisting of two edge-shared IO6 octahedra. They are connected with LiO6 octahedra via common edges and vertices. The crystals are non-merohedrally twinned along (100).
    Notes: Li2H4I2O10 wurde als Zwischenstufe während der Entwässerung von LiH4IO6 · H2O zu LiIO4 erstmals erhalten. Nach der Röntgenstrukturanalyse (monoklin, P21/n, a = 533,98(4), b = 471,85(4), c = 1431,48(10) pm, β = 91,614(7)°, Z = 2, 726 unabhängige Reflexe, R = 0,056) liegt das bisher unbekannte Tetrahydrogendimesoperiodatanion H4I2O102- in Form zweier kantenverknüpfter IO6-Oktaeder vor, die ihrerseits mit LiO6-Oktaedern kanten- und eckenverknüpft sind. Die Kristalle sind systematisch verzwillingt. Es handelt sich um monokline Ebenenzwillinge nach (100).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 18 (1979), S. 464-464 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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