New solvatochromic merocyanine dyes based on Barbituric acid and Meldrum's acid |
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Authors: | Sheng Wang Sung-Hoon Kim |
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Affiliation: | aDepartment of Textile System Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea;bSchool of Chemistry Science and Technology, Zhanjiang Normal University, Zhanjiang 524048, PR China |
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Abstract: | 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 different polarities were measured; positive solvatochromism, with a large absorption bathochromic shift, was observed on moving from xylene to DMSO, corresponding to their maximum fluorescence emission with a large bathochromic shift. The dyes have the potential for the development of efficient probes for the detection of volatile organic compounds. |
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Keywords: | Solvatochromism Merocyanine dyes Meldrum's acid Barbituric acid Polarity Bathochromic shift |
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