Polymethine Dye Synthesis and Its Leuco Property Investigation

Abstract

Polymethine dyes have been synthesized using bis-dimethylaminophenylethylene compound. These dyes can be converted to the colorless leuco form by the treatment with alkali. Interestingly, these leuco dyes showed reversible color formation properties with following acid addition. The feasibility of the use as thermochromic indicator was investigated using bisphenol A and 1-hexadecanol.

Keywords:

• leuco
• polymethine dye
• reversible
• thermo chromic-indicator