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- W2053282475 abstract "Gemessen wurden die Raman-Intensitäten S1600 der Ringschwingung bei 1600 cm−1 von 46 monosubstituierten Benzolderivaten und Sco der CO-Valenzschwingung von 10 monosubstituierten Benzolderivaten mit der 459 cm−1-Linie von Tetrachlorkohlenstoff als Standard. Es wird gezeigt, daß diese Raman-Intensitäten durch das Ausmaß der π-Elektronenkonjugation zwischen Ring und Substituenten bestimmt werden. Für mehrere Verbindungen existiert eine Korrelation zwischen den Raman-Intensitäten der 1600 cm−1-Ringschwingung und den Taftschen Substituentenparametern σ0R. Es wird gezeigt, daß σ0R kein direktes Maß der Konjugation sein kann. Es gibt zahlreiche Verbindungen, wie z. B. Styrol, mit großer Konjugation zwischen Ring und Substituenten, deren σ0R-Werte klein sind. Man kann annehmen, daß σ0R ein Maß ist für den Substituenteneffekt auf die Elektronendichteverteilung, der durch Konjugation bestimmt ist. The Raman-intensities S1600 of the ring vibration near 1600 cm−1 of 46 monosubstituted benzene derivatives and Sco of the CO-stretching vibration of 10 monosubstituted benzene derivatives have been measured with the 459 cm−1 line of carbon tetrachloride as a standard. It is shown that these Raman-intensities depend on the degree of π-electron conjugation between ring and substituents. For several compounds exists a correlation between the Raman-intensities of the 1600 cm−1 ring vibration and the σ0R substituent parameters of Taft. The σ0R-parameter can not be used as a direct measure of conjugation. There are numerous compounds having great conjugation between ring and substituents of small σ0R values, e.g. styrene. It should be assumed that σ0R describes the substituent effect on the electron density distribution which is determined by conjugation." @default.
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- W2053282475 date "1971-12-01" @default.
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- W2053282475 title "Raman-Intensität und Konjugation I. Substituentenabhängigkeit der Raman-Intensitäten der 1600 cm<sup>−1</sup>-Ringschwingungen monosubstituierter Benzolderivate" @default.
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- W2053282475 doi "https://doi.org/10.1002/bbpc.197100013" @default.
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