Visible Light Spectroscopic Analysis of Methylene Blue in Water; What Comes after Dimer?

ABSTRACT: As in our previous work, most attempts to study the self-aggregation of methylene blue (MB) in water have been limited to the dimer. In the present work, we have analyzed the self-aggregation of MB in water beyond the dimeric form. For this purpose, the visible light absorption spectra of a large number of aqueous solutions of MB (1.1 × 10^-6 to 3.4 × 10^-3 M) and NaCl (0.0-0.15 M) at different temperatures (282-333 K) have been fed to a mathematical routine in order to determine the potential existence of a unique higher-order aggregate without any preconception about the aggregation order or about the need of counterions, such as chloride, for compensating the positive charge of the aggregates. Contrary to the common belief that the trimer is the dominant aggregate at

SUBMITTER: Fernandez-Perez A 

PROVIDER: S-EPMC7689667 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature