Über Pyridinium-N-phenolat-Betaine und ihre Verwendung zur Charakterisierung der Polarität von Lösungsmitteln, X. Erweiterung, Korrektur und Neudefinition der ET-Lösungsmittelpolaritätsskala mit Hilfe eines lipophilen penta-tert-butyl-substituierten Pyridinium-N-phenolat-Betainfarbstoffes

Die Darstellung des negativ solvatochromen, lipophilen penta-tert-butylsubstituierten Betainfarbstoffes 1d und die lineare Korrelation zwischen Z- und ET(30)-Werten gestatten eine erhebliche Erweiterung der ET(30)-Losungsmittelpolaritatsskala, deren Umwandlung in die dimensionslose ENT-Skala vorgeschlagen wird [Gleichung (5)]. Die ENT-Werte fur 243 Losungsmittel werden in Tab. 3 zusammengefast. Pyridinium N-Phenoxide Betaines and their Application for the Characterization of Solvent Polarities, X. – Extension, Correction, and New Definition of the ET Solvent Polarity Scale by Application of a Lipophilic Penta-tert-butyl-substituted Pyridinium N-Phenoxide Betaine Dye The synthesis of the negatively solvatochromic, lipophilic penta-tert-butyl-substituted betaine dye 1d and the linear correlation between ZET(30) values permit a considerable enlargement of the ET(30) solvent polarity scale, the conversion of which into the dimensionless ENT scale is proposed [Equation (5)]. The ENT values for 243 solvents are compiled in Table 3.

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