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    STUDIA CHEMIA - Issue no. 2 / 2018  
         
  Article:   (PHENOTHIAZINYL)VINYL-INDOLIUM CATIONIC DYES.

Authors:  BALÁZS BRÉM, QUENTIN COLANGE, EMESE GÁL, DAN PORUMB, CASTELIA CRISTEA, LUIZA GĂINĂ, TAMÁS LOVÁSZ, LUMINIŢA SILAGHI-DUMITRESCU.
 
       
         
  Abstract:  New 2-(2-(10H-phenothiazin-3yl)vinyl)-3H-indolium cationic dyes were successfully prepared by Knoevenagel condensation of 1,2,3,3-tetramethyl-3H-indolium iodide with 10-methyl-10H-phenothiazine-3-carbaldehyde and 10H-phenothiazine-3-carbaldehyde respectively. Their optical properties were emphasized by UV-Vis absorption spectroscopy. The position of their characteristic intramolecular charge transfer absorption maxima is situated in the visible range (550-630 nm), exhibiting solvatochromism induced by solvent polarity. Experimental evidences of linear optical properties were completed by a theoretical DFT computational study.

Keywords: 10H-phenothiazine, indolium salts, cyanine dyes
 
         
     
         
         
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