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Two new types of solvatochromic merocyanine dyes derived from either Meldrum's acid or Barbituric acid have been synthesized by the condensation of 4-((2-hydro xyethyl)(methyl)amino) benzaldehyde with 5-(2,6-dimethyl-4H-pyran-4-ylidene) Meldrum's acid and 5-(2,6-dimethyl-4H-pyran-4-ylidene) Barbituric acid, respectively. The solvatochromic responses of the merocyanine dyes in 22 solvents of widely...
Tetrahydroquinoxaline based squaraine dyes synthesized by the condensation reaction between squaric acid and different tetrahydroquinoxaline derivatives are described. The squaraines gave a strong intense peak at 700 nm and were found to exhibit good molar extinction coefficient (>10 5 M −1 cm −1 ). Metal binding studies were carried out with different metal ions and it...
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