• Dr. Ganga Das

In the present work, it has been proposed to synthesizes hemicyanine dye through preparation of quaternised benzothiazole salts. The preparation of quaternised benzothiazole salts involved into two steps first is preparation of benzothiazoles and Second is Quaternisation. Synthesis of hemicyanine derived from quaternised benzothiazole salts and 4, 4 – Bis(dimethylamino) phenyl ketone of five benzothiazole salts. 3-Ethyl-6-iodo-2-(2-4', 4"- bisdimethylamino phenyl ethenyl) benzothiazolium iodide, 6-Chloro-3-ethyl-2-(2-4', 4"- bisdimethyl aminophenylethenyl) benzothiazolium iodide, 3-Ethyl-2-(2-4',4"-bisdimethylaminophenyl ethenyl) benzothiazolium iodide, 3-Ethyl-6-methyl-2-(2-4', 4"- bisdimethyl aminophenylethenyl) benzothiazolium iodide,3-Ethyl-6-methoxy-2-(2-4, 4"- bisdimethyl aminophenylethenyl) benzothiazolium iodide have been chosen and synthesised in quantitative yield. The use of above mentioned ketones, not only provide a means of weighining the dye molecule but also furnishes a means to study the role of steric and electronic effect of substitutions in the prime chromophoric methane chain. Keeping in view the multidimentional applications of cyanine and hemicyanine dyes, it was through to synthesise some new hemicyanine dyes by condensing some suitable auxochromic chalcones and benzophenons with quarternised benzothiazolium salts in presence of suitable basic catalyst and study their optical characteristics i.e. U. V. absorption.

Cyanine and Hemicyanine dyes, benzothiazolium salts Bis-dimethylamino phenyl ketone and Iodide

"Synthesis of Hemicyanine dyes derived from benzothiazole saits and 4, 4’- Bis-dimethylamino phenyl ketone", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 6, page no.613-617, June-2018, Available :http://www.jetir.org/papers/JETIR1806889.pdf

"Synthesis of Hemicyanine dyes derived from benzothiazole saits and 4, 4’- Bis-dimethylamino phenyl ketone", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 6, page no. pp613-617, June-2018, Available at : http://www.jetir.org/papers/JETIR1806889.pdf