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Tetrahydroquinoxaline based squaraines: Synthesis and photophysical properties
Authors:Yogesh Chandrasekaran  Gitish K. Dutta  Raja Bhaskar Kanth  Satish Patil
Affiliation:1. Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China;2. National Food Quality Supervision and Inspection Center (Shanghai)/Shanghai Institute of Quality Inspection and Technical Research, Shanghai 200233, PR China;3. State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China;1. State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, Fujian, PR China;2. Key Laboratory of Analysis and Detection for Food Safety, Ministry of Education & Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and Department of Chemistry, Fuzhou University, Fuzhou 350108, Fujian, PR China
Abstract: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 (>105 M?1 cm?1). Metal binding studies were carried out with different metal ions and it was found that it was selective in the case of copper metal. Using Job's plot it was ascertained that the squaraines bind to the copper metal in the ratio of 2:1.
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