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  • General Chemistry
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  • 2015-2019
  • 1975-1979  (10)
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  • 1975  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 425-438 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Felddesorption (FD) ermöglicht die massenspektrometrische Untersuchung großer organischer Moleküle ohne deren Verdampfung. Der gegenwärtige Stand des theoretischen Verständnisses der Ionisierung dieser Moleküle im adsorbierten Zustand an organischen Emittern wird beschrieben. Die speziellen Probleme der Technik sowie aussichtsreiche apparative Entwicklungen für künftige analytische Aufgaben werden umrissen. Im Mittelpunkt des Fortschrittsberichtes stehen analytische Untersuchungen von biochemischen Modellverbindungen sowie Abbauprodukten von Umweltchemikalien und Arzneimitteln. Die Methode eignet sich besonders für den Nachweis und die Identifizierung von Submikrogramm-Mengen polarer, underivatisierter Substanzen in komplizierten Gemischen oder vorgereinigten Extrakten aus biologischem Material.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 439-447 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In den Jahren seiner Tätigkeit am Weizmann Institut of Science begann G. M. J. Schmidt seine Arbeiten über die Beziehungen zwischen der Struktur organischer Kristalle und der in ihnen stattfindenden chemischen Reaktionen, ein Forschungsvorhaben, das sich in der Folge als außergewöhnlich fruchtbar erwiesen hat. So wuchs seine „Festkörper-Gruppe“ und wurde divergenter - Röntgenstrukturanalytiker, Organiker, Spektroskopiker und schließlich sogar Theoretiker wirkten mit. Professor Schmidt starb 1971. Als eines der Mitglieder dieser Gruppe folge ich nun der Einladung, über neuere Entwicklungen auf meinem Interessengebiet zu berichten.Ein Großteil der bisher untersuchten Reaktionen organischer Kristalle wird durch Licht oder andere Strahlung induziert. Dies ist eine natürliche Folge davon, daß Strahlung, ungleich den meisten chemischen Reaktanden, leicht die Oberfläche des Kristalls durchdringen und so die zu aktivierenden Orte erreichen kann. In diesem Beitrag sollen einige der in der Photochemie organischer Kristalle wirksamen Prinzipien aufgezeigt und anhand von Beispielen verdeutlicht werden, wobei nicht beabsichtigt ist, alle bisher untersuchten unterschiedlichen Reaktionstypen und Systeme zu erfassen.Es ist geboten, hier in Anerkennung auch eines anderen großen Wissenschaftlers zu gedenken, der vor kurzer Zeit verschied - Theodor Förster. Manche der Ideen, auf die ich im folgenden eingehe, wurzeln, wie so vieles in der jüngsten Entwicklung der Photochemie, in Professor Försters früheren Arbeiten.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 476-483 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Trennung molekularer Mischungen mit semipermeablen Membranen unter der treibenden Kraft eines hydrostatischen Druckes hat in den letzten Jahren große Bedeutung erlangt. Entscheidend dafür war unter anderem die Entwicklung asymmetrisch strukturierter Membranen, die bei gleichen Trenneigenschaften eine um ein Vielfaches höhere Filtrationsleistung aufweisen als die bis dahin bekannten symmetrischen Membranen. Im vorliegenden Fortschrittsbericht werden die Strukturen asymmetrischer Membranen sowie Verfahren zu ihrer Herstellung aus verschiedenen Polymeren und ihrer Anwendung zur Trennung molekularer Mischungen diskutiert.
    Additional Material: 8 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 208-209 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 709-710 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 166-167 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 452-459 
    ISSN: 0570-0833
    Keywords: Asymmetric membranes ; Membranes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The separation of molecular mixtures by semipermeable membranes under the driving force of hydrostatic pressure has assumed major importance in recent years. Among other factors the development of membranes with asymmetric structure which, while having the same separating properties, afford a filtration output many times greater than that of the previously known symmetrical membranes, was decisive for this method. In the present progress report the structures of asymmetric membranes are discussed, as well as their preparation from various polymers and their application to the separation of molecular mixtures.
    Additional Material: 8 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 403-415 
    ISSN: 0570-0833
    Keywords: Mass spectrometry ; Analytical methods ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Field desorption (FD) enables mass-spectrometric investigation of large organic molecules without their vaporization. The present state of our theoretical understanding of the ionization of these molecules in the adsorbed state on organic emitters is described. The special problems of the technique and prospective developments in the apparatus for future analytical problems are outlined. The present progress report concentrates on analytical studies of biochemical model compounds and degradation products from environmental chemicals and drugs. The method is particularly suitable for the detection and identification of submicrogram quantities of underivatized polar substances present in complex mixtures or pre-purified extracts from biological materials.
    Additional Material: 19 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 386-393 
    ISSN: 0570-0833
    Keywords: Photochemistry ; Solid-state photochemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: During the years that he was at the Weizmann Institute of Science the late G. M. J. Schmidt initiated and developed a very vital research program on the relationship between the structures of organic crystals and the reactions which occur in these crystals. As the program developed the “solid-state group” became larger and more diversified - X-ray crystallographers, organic chemists, spectroscopists, and even theoreticans had their contributions to make. Professor Schmidt died in 1971. As one of the members of this group, I here present a review of recent developments in parts of the field of interest to me.Of the reactions of organic crystals which have been studied thus far a large number are induced by light and other radiation. This is because radiation, unlike most chemical reactants, can readily penetrate the surface of the crystal, and thus reach the sites one wishes to activate. It is my aim in this article to point out some of the principles operative in the photochemistry of organic crystals. I shall choose examples to illustrate these principles and will not attempt to cover all the various types of reaction and systems which have been studied.It is appropriate at this stage to pay tribute to the memory of another great scientist who recently passed away - Theodorr Föster. Many of the ideas which I develop here are extensions of Professor Förster's earlier work, as are so many of the recent developments in photochemistry.
    Additional Material: 7 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 700-702 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
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