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  • Bischler-Napieralski reaction  (3)
  • Solid-state reactions  (3)
  • Ceramics  (2)
  • Fullerenes  (2)
  • Iod  (2)
  • magnetic properties  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1761-1764 
    ISSN: 0009-2940
    Schlagwort(e): Endohedral ; Barium ; Fullerenes ; Dibarium fullerenes ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A new route to endohedral fullerenes involving the evaporation of carbon and a metal at different positions, i.e. at different temperatures, in a radio-frequency furnace is described. For the first time, endohedral barium fullerenes within the composition range Ba@C74 to Ba@C136 have been produced in high yields as compared to hollow fullerenes, and have been extracted with CS2. Ba@C60, and Ba@C70, are only soluble in CS2 following sublimation. Furthermore, the first nonlanthanoid dimetallo fullerenes ranging in composition from Ba2@C88 to Ba2@C116 have been obtained. All endohedral barium fullerenes were characterized by mass spectrometry. Properties such as sublimation behaviour, solubility, and sensitivity to air have been studied.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 447-457 
    ISSN: 0947-3440
    Schlagwort(e): Isoquino[1,2-b][3]benzazepines ; Iso-C-homoberbines ; Conformation analysis ; Bischler-Napieralski reaction ; Methyl ∊-hydroxycarboxylates ; Heterocycles ; Alkaloids ; Drug research ; Medicinal chemistry ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthesis and Conformation of Hexahydro-isoquino[1.2.-b][3]benzazepinesThe synthesis of the six hexahydro-isoquino[1,2-b][3]benzazepines 13a-f is described; their conformation is investigated by NMR spectroscopic methods, X-ray analysis and dehydrogenation with mercury(II) acetate.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 75-81 
    ISSN: 1434-1948
    Schlagwort(e): TSDE ; Ceramics ; Theoretical IR-spectroscopy ; RI-MP2 ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A new compound for the molecular synthesis route to high-demand Si/B/N/C ceramics has been found and is described in this work. We report on an elegant “one-pot” synthesis of [(trichlorosilyl)dichloroboryl]ethane (TSDE, Cl3Si-CH[(CH3)(BCl2)]) and its structural characterisation by means of nuclear magnetic resonance and (theoretical and experimental) infra-red spectroscopy. Density functional and Hartree-Fock calculations combined with a perturbational treatment of the electron correlation have been performed. Both methods yield good agreement of theoretical and experimental spectra, with the perturbational approach being slightly superior. In a similar way to the amino compound [(trichlorosilyl)amino]dichloroborane (TADB), TSDE exhibits a planar coordination of the dichloroboryl terminus but tetrahedral neighbourhoods for both carbon and silicon. The electronic structure has been investigated and a σ - n order of the frontier orbitals shall be discussed.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    ISSN: 0947-3440
    Schlagwort(e): Isoquino[3,2-a][2]benzazepines ; B-Homoberbines ; Bischler-Napieralski reaction ; Calculations, MMX force-field ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthesis and Conformation of Hexahydro-isoquino[3,2-a][2]benzazepines of the B-Homoberbine TypeThe two-step synthesis of the hexahydro-isoquino[3,2-a][2]-benzazepines („B-homoberbines“) 4b-e is described. The main and some further products of the Bischler-Napieralski reaction of hydroxyamide 3c were isolated and identified. The conformation of the B-homoberbines was investigated by X-ray analysis, spectroscopic methods and dehydrogenation with mercury(II) acetate.
    Zusätzliches Material: 5 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    ISSN: 0044-8249
    Schlagwort(e): Iod ; Metaperiodsäure ; Neutronenbeugung ; Strukturaufklärung ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 255-256 
    ISSN: 0044-8249
    Schlagwort(e): Iod ; Nichtmetallchemie ; Sauerstoff ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 201-206 
    ISSN: 0044-2313
    Schlagwort(e): Ternary oxides ; anionic gold ; Cs3AuO ; Rb3AuO ; K3AuO ; preparation ; single-crystal structure determination ; analysis of molar volumes ; electrical conductivity ; magnetic properties ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Ternary Oxides containing Anionic GoldThe preparation and crystal structure of the novel ternary oxides M3AuO (M = Cs, Rb, K) containing anionic gold is reported. Cs3AuO (a = 7.830(1) Å, c = 7.060(1) Å) crystallizes as a hexagonal, Rb3AuO (a = 5.501(1) Å) and K3AuO (a = 5.240(1) Å) as a cubic anti perovskite. Concerning to the ionic description (M+)3Au-O2- in Cs3AuO gold exists as an anion. In Rb3AuO and K3AuO the anionic character of gold decreases respectively. The analysis of bond length and molar volumes gives support to this view, as well as investigations of conductivity and magnetic properties do.
    Notizen: Über die Darstellung und Kristallstrukturen der neuen ternären Oxide M3AuO (M = Cs, Rb, K) mit anionischem Gold wird berichtet. Cs3AuO (a = 7,830(1) Å, c = 7,060(1) Å) kristallisiert als hexagonaler, Rb3AuO (a = 5,501(1) Å) und K3AuO (a = 5,240(1) Å) als kubischer anti-Perowskit. Gemäß der Formulierung (M+)3Au-O2- liegt Gold in Cs3AuO als Anion vor. In den Verbindungen der leichteren Alkalimetalle nimmt der anionische Charakter von Gold sukzessiv ab. Die Analyse der Bindungslängen und Molvolumina belegt diese Sichtweise, ebenso die durchgeführten Leitfähigkeitsuntersuchungen und magnetischen Messungen.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 1135-1142 
    ISSN: 0170-2041
    Schlagwort(e): Isoquino[2,1-b][2]benzazepines ; C-Homoberbines ; Bischler-Napieralski reaction ; Conformation studies of the homoberbines ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthesis and Conformation of the Hexahydro-isoquino[2,1-b][2]benzazepinesThe synthesis of Hexahydro-isoquino[2,1-b][2]benzazepines 6a-c in a three-step reaction is reported; their conformation is investigated by spectroscopic methods, X-ray analysis and dehydrogenation with mercury(II) acetate.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 26 (1987), S. 1098-1110 
    ISSN: 0570-0833
    Schlagwort(e): Bond theory ; Solid-state reactions ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The distinction between valence electrons and essentially inactive core electrons is the basis of many classifying concepts in chemistry. However, it has recently been recognized that this is an oversimplification and should, at least in some areas of chemistry, be modified. Many cases are known where cations with closed d10 configurations are subject to homoatomic interactions that influence structure and properties. A characteristic and surprisingly uniform structural feature (e.g., of a number of compounds containing monovalent coinage metals) is a clusterlike assembly of d10 cations that corresponds in geometry and bond lengths to fragments of the metal structures themselves. Further evidence for a special type of bonding in such compounds is provided by their physical properties; for example, the absorption in the UV/VIS region shows a drastic redshift and the compounds are often conductors or semiconductors. The d electrons in such cases have obviously lost their pure “core” nature. All bonding models so far proposed for such systems involve mixing of higher orbitals.
    Zusätzliches Material: 20 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 689-693 
    ISSN: 0044-2313
    Schlagwort(e): Fullerenes ; endohedral metallofullerenes ; preparation ; thermodynamics of formation ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Formation of Fullerenes and Endohedral Metallofullerenes: Preparation in a Radiofrequency FurnaceA thermodynamic analysis of the reaction of formation is presented for C60. The alternative route for the preparation of fullerenes by evaporating carbon in a RF-furnace is described. This process is characterized by its broad variability and by comparatively mild conditions which, in addition, may be measured and controlled rather precisely. Thus, it offers favorite facilities for the production of soots with high contents of fullerenes and endohedral fullerenes. So far, LaC82 could be extracted using toluene.
    Notizen: Eine thermodynamische Analyse der Bildungsreaktion von C60 wird gegeben und die Darstellung von Fullerenen im Hochfrequenzofen beschrieben. Dieses neue Verfahren zeichnet sich durch eine hohe Variabilität und vergleichsweise schonende Bedingungen aus, die gut meß- und kontrollierbar sind. Es bietet daher günstige Voraussetzungen zur Herstellung von Rußen mit gesteigerten Anteilen höherer Fullerene und, im Falle von Coverdampfungen, endohedraler Metallofullerene. Bisher konnte in Toluolextrakten LaC82 nachgewiesen werden.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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