Untersuchungen zur Polarität wäßriger Harnstoff‐ und Zucker‐Lösungen mit der Methode der vergleichenden Solvatochromie

Abstract

Investigations on the Polarity of Aqueous Solutions of Urea and Various Sugars by Means of the Solvatochromic Technique The dipolarity/polarizability and acidity of aqueous solutions of urea derivatives and sugars have been investigated by means of the solvatochromic technique employing several indicator dyes such as various pyridinium N ‐phenoxide betaine dyes, Michler's ketone and Fe(phen) 2 (CN) 2 . Increasing concentration of both urea and sugars decreases the polarity and acidity of the aqueous solution as a whole. Advantageously, in the case of urea derivatives, increasing concentration significantly improves the polarizability of aqueous solutions, which is responsible for the solubility of hydrophobic compounds in water.