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  • 1
    ISSN: 0947-6539
    Keywords: copper compounds ; exchange coupling ; heterometallic compounds ; lanthanide compounds ; magnetic properties ; structure elucidation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and structural characterisation of three copper-lanthanoid complexes are reported. The compounds, of general formula [Cu3M(chp)8(NO3)(S)] [M = Gd, S = H2O in 2; M = Dy, S = H2O in 3; M = Er, S = (H2O)0.5(MeOH)0.5 in 4; chp = anion of 6-chloro-2-pyridone], are made by reaction of [Cu2(chp)4] (1) with the hydrated lanthanoid nitrate salt in methanol. Structural studies reveal the three copper atoms lie in an approximate hemisphere about a central lanthanoid atom. Magnetic studies on 2 and two further Cu-Gd complexes show ferromagnetic coupling between the 3d and 4f metals. Consideration of these results along with magnetic data previously reported for Cu-Gd compounds leads to a correlation between the magnitude of this exchange coupling and the exponential of the Cu…Gd distance. This is the first magneto-structural correlation reported for mixed d-block/f-block metal complexes.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 108 (1996), S. 748-768 
    ISSN: 0044-8249
    Keywords: Ladungsdichtewellen ; Nanosynthese ; niederdimensionale Materialien ; Rasterkraftmikroskopie ; Rastertunnelmikroskopie ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rastersondenmikroskope wie das Rastertunnelmikroskop und das Rasterkraftmikroskop sind hervorragende Werkzeuge für die Untersuchung der mikroskopischen Eigenschaften von Oberflächen. Verwendet man sie zum Studium niederdimensionaler Materialien, etwa zweidimensionaler Festkörper wie Graphit oder nulldimensionaler Nanostrukturen, lassen sich auch strukturelle und elektronische Eigenschaften auf atomarer Skala erforschen, die für die gesamte Probe und nicht nur für die Oberfläche charakteristisch sind. Kombiniert man solche Untersuchungen mit der chemischen Synthese oder der direkten Manipulation von Atomen, so können auch Beziehungen zwischen der Zusammensetzung, der Struktur und den physikalischen Eigenschaften verständlich und somit die chemischen Grundlagen der Materialeigenschaften verdeutlicht werden. Dieser Artikel zeigt, daß die Kombination der Rastersondenmikroskopien mit der chemischen Synthese das Verständnis der Ladungsdichtewellen und der Hochtemperatur-Supraleitung erweitert sowie die Herstellung von Nanoteilchen in niederdimensionalen Materialien vorangebracht hat. Weiterhin wurde aufgezeigt, wie dotierte Materialien mit Ladungsdichtewellen wechselwirken; ebenso wurde das Verständnis der lokalen Kristallchemie komplizierter Kupferoxide erweitert, mikroskopische Details über die supraleitenden Zustände in Hochtemperatur-Supraleitern enthüllt und neue Ansätze zur Herstellung von Multikomponenten-Nanostrukturen hervorgebracht. Die Kopplung rastersondenmikroskopischer Messungen und Manipulationen mit chemischer Synthese ist ein allgemeiner Ansatz, um Materialeigenschaften besser zu verstehen und komplexe Nanostrukturen gezielter zu erzeugen.
    Additional Material: 29 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 35 (1996), S. 686-704 
    ISSN: 0570-0833
    Keywords: atomic force microscopy ; low-dimensional materials ; nanosyn-theses ; scanning tunneling microscopy ; superconductivity ; Scanning probe microscopy ; Low-dimensional materials ; Nanostructures ; Scanning probe microscopy ; Superconductors ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Scanning probe microscopies, such as scanning tunneling microscopy and atomic force microscopy, are uniquely powerful tools for probing the microscopic properties of surfaces. If these microscopies are used to study low-dimensional materials, from two-dimensional solids such as graphite to zero-dimensional nanostructures, it is possible to elucidate atomic-scale structural and electronic properties characteristic of the bulk of a material and not simply the surface. By combining such measurements with chemical synthesis or direct manipulation it is further possible to elucidate relationships between composition, structure, and physical properties, thus promoting an understanding of the chemical basis of material properties. This article illustrates that the combination of scanning probe microscopies and chemical synthesis has advanced our understanding of charge density waves, high-temperature superconductivity, and nanofabrication in low-dimensional materials. This new approach to studying materials has directly contributed to our knowledge of how metal dopants interact with charge density waves and elucidated the local crystal chemistry of complex copper oxides, microscopic details of the superconducting states in materials with a high superconducting transition Ic, and new approaches to the fabrication of multi-component nanostructures. Coupling scanning probe microscopy measurement and manipulation with chemical synthesis should provide an approach to understanding material properties and creating complex nanostructures in general.
    Additional Material: 29 Ill.
    Type of Medium: Electronic Resource
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