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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 445 (1978), S. 219-226 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Silanols. XIV. I. R. Spectroscopic Investigation on Halogenomethyl-, Benzyl-, and α-Halogenobenzyl-dimethylsilanolsPosition of vOH band and the shift Δ\documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \nu $\end{document} of this band at association with diethylether have been measured for silanols of the type X(CH3)2SiOH with X = CH3, CH2Cl, CH2Br, CH2J, CHCl2, CH2C6H5, CHClC6H5, CHBrC6H5.For both \documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \nu $\end{document}OH and Δ\documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \nu $\end{document} and linear correlations with σ* constants of substituents X have been found. These correlations are compared with results of analog investigations on triarylsilanols [2]. From band shapes result informations on weak intramolecular H-bonding between OH group and halogeno resp. phenyl substituents.
    Notes: Es wurden die Lage der vOH-Bande sowie deren Verschiebung Δ\documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \nu $\end{document} bei Assoziation mit Diäthyläther für Silanole des Typs X(CH3)2SiOH mit X = CH3, CH2Cl, CH2Br, CH2J, CHCl2, CH2C6H5, CHClC6H5, CHBrC6H5 gemessen.Sowohl für die \documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \nu $\end{document}OH als auch für die Δ\documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \nu $\end{document} ergeben sich lineare Korrelationen mit den σ*-Konstanten der Substituenten X. Diese Korrelationen werden mit Ergebnissen analoger Untersuchungen an Triarylsilanolen [2] verglichen. Aus der Form der OH-Banden ergeben sich Hinweise auf schwache intramolekulare H-Brückenbindungen zwischen der OH-Gruppe und den Halogen- bzw. Phenyl-Substituenten.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1978-10-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 3
    Publication Date: 2000-12-29
    Description: For over a century the arrow has appeared in illustrations of cerebral function, yet the implications of using such symbols have not been previously considered. This review seeks to outline the nature, evolution, applications and limitations of this deceptively simple graphic device when it is used to picture functions of the brain. The arrow is found to have been used in several different ways: as a means of endowing anatomical structures with functional properties; as a method of displaying neural function either in free–standing form or in a structural or spatial framework; as a device for correlating functional data with underlying brain topography; and as a technique for linking functions of the brain with the world outside and with various philosophical concepts. For many of these uses the essential feature of the arrow is its directional characteristic. In contrast to the line, it is direction that enables the arrow to display information about time, which in turn can be exploited to depict functional rather than structural data. However, the use of the arrow is fraught with difficulties. It is often unclear whether an arrow has been used to illustrate fact, hypothesis, impression or possibility, or merely to provide a decorative flourish. Furthermore, the powerful symbolic nature of the arrow can so easily confer a spurious validity on the conjectural. Increasingly now there are insuperable difficulties when attempting to illustrate complex mechanisms of brain function. In the iconography of cerebral function, therefore, arrows with all their ambiguities may in certain circumstances become superseded by more non–representational symbols such as the abstract devices of the computational neuroscientist.
    Print ISSN: 0962-8436
    Electronic ISSN: 1471-2970
    Topics: Biology
    Published by The Royal Society
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