SOLVATOCHROMISM OF ASYMMETRICAL SUBSTITUTED 3,7-DIAMINOPHENOTHIAZINIUM DYE

Camelia  CIOBOTARIU; Lucian Cornel  POP; Dan Ioan  PORUMB

Authors

Camelia CIOBOTARIU Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania. Corresponding author: ioan.porumb@ubbcluj.ro.
Lucian Cornel POP Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania. Corresponding author: ioan.porumb@ubbcluj.ro.
Dan Ioan PORUMB Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania. Email: ioan.porumb@ubbcluj.ro. https://orcid.org/0000-0001-6388-2686

Keywords:

phenothiazin-5-ium, cationic dye; UV-Vis absorption, solvatochromism, Lucian Cornel POP

Abstract

A convenient procedure for the synthesis of 3-diethylamino-7-phenylaminophenothiazin-5-ium iodide was developed and the solvatochromism of this blue dye was examined by means of UV-Vis spectroscopy. The maximum of the absorption wavelength was detected in the range 550-665 nm, the asymmetrical phenothiazinium dye exhibiting a large red shift upon variation of the solvent structure from aprotic dipolar (THF, DMF) to protic solvents (water, methanol, acetic acid).

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