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- W2092466411 abstract "Pyridinium N-Phenoxide Betaines and Their Application for the Characterization of Solvent Polarities, XVIII. – Synthesis and UV/Vis Spectroscopic Properties of a Negatively Solvatochromic Pyridinium N-Thiophenoxide Betaine Dye Synthesis and UV/Vis spectroscopic properties of the negatively solvatochromic, relative to 1 homomorphic, thiobetaine dye 2 are described. The new thiobetaine 2 exhibits an even larger negative solvatochromism and thermochromism than the standard betaine dye 1, which has been used to establish an empirical scale of solvent polarity, the so-called ET(30) scale. Surprisingly, there exists a linear correlation between the ETO(30) values of 1 and the ETS(30) values of 2 for both aprotic and protic solvents, despite of the fact that sulfur is usually known to act as worse hydrogen-bond acceptor than oxygen. Possible reasons for this extraordinary behaviour of 2 are discussed. In contrast to 2, the sulfo-substituted betaine dye 4 does not exhibit any solvatochromism." @default.
- W2092466411 created "2016-06-24" @default.
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- W2092466411 date "1991-10-16" @default.
- W2092466411 modified "2023-10-03" @default.
- W2092466411 title "Über Pyridinium-N-phenolat-Betaine und ihre Verwendung zur Charakterisierung der Polarität von Lösungsmitteln, XVIII. Synthese und UV/Vis-spektroskopische Eigenschaften eines negativ solvatochromen Pyridinium-N-thiophenolat-Betainfarbstoffs" @default.
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- W2092466411 doi "https://doi.org/10.1002/jlac.1991199101174" @default.
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