The brilliant blue FCF ion-molecular forms in solutions according to the spectrophotometry data


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Abstract

The brilliant blue FCF acid–base properties in aqueous solutions have been studied and its ionization constants have been defined by tristimulus colorimetry and spectrophotometry methods. The scheme of the acid–base dye equilibrium has been proposed and a diagram of the distribution of its ionic-molecular forms has been built. It has been established that the dominant form of the dye was the electroneutral form, which molar absorptivity (ε625 = 0.97 × 105) increases with the increase of the dielectric permittivity of the solvent. It has been shown that the replacement of polar solvents by less polar ones is causing a bathochromic shift of the maximum absorption band of the dye, the value of which is correlated with the value of the Hansen parameter. Tautomerization constants have been defined in a number of solvents and associated with the value of the Dimroth-Reichardt parameter.

About the authors

A. N. Chebotarev

Odessa National I.I. Mechnikov University

Author for correspondence.
Email: alexch@ukr.net
Ukraine, Odessa

K. V. Bevziuk

Odessa National I.I. Mechnikov University; Pavol Jozef Šafárik University in Košice

Email: alexch@ukr.net
Ukraine, Odessa; Košice

D. V. Snigur

Odessa National I.I. Mechnikov University

Email: alexch@ukr.net
Ukraine, Odessa

Ya. R. Bazel

Pavol Jozef Šafárik University in Košice; Uzhhorod National University

Email: alexch@ukr.net
Slovakia, Košice; Uzhhorod

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