D.I. Mendeleev’s concentration decrement in lucigenin aqueous solutions

Abstract

The article discusses the results of study for the optical properties (luminescence) of aqueous solutions with low concentrations of lucigenin. One new methodology for the mathematical processing of luminescence spectra is presented. The method to prepare the solutions, which can be used to identify critical points (D.I. Mendeleev's decrement) in the physicochemical properties of aqueous solutions, is considered.

Dilution Rhythms of Aqueous Solutions

“…Nevertheless, luminescence of the aqueous solution at the wavelengths typical of lucigenin are still detected at further dilutions of the aqueous solutions (Fig. 1) [7]. It is seen in Fig.…”

“…Note that when the aqueous solution of lucigenin (10,10'-dimethyl-9,9'-biacridinium dinitrate, Lc, MW 512.51) is diluted according to the scheme given in [6] and practically used in [7], it is already at the tenth dilution that no molecules of the diluted substance are found in the aqueous solution. Nevertheless, luminescence of the aqueous solution at the wavelengths typical of lucigenin are still detected at further dilutions of the aqueous solutions (Fig.…”