Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 177, Issue 1, Pages 55-60Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2005.05.011
Keywords
chemosensor; coumarin; intramolecular proton transfer; solvatochromic shift; chelation-enhanced fluorescence
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The title compound, a new coumarin based fluorophore having a piperazine moiety as the photoinduced electron transfer (PET) switch was prepared and its photophysical properties studied in various solvents and under different pH. Solvatochromic shift in the fluorescence spectrum revealed an increase in the dipole moment in the lowest excited singlet state compared to that in the ground state. The compound also showed an interesting intramolecular photoinduced proton transfer phenomenon in the excited state under neutral pH. It was effectively utilized as a new Chelation-enhanced fluorescence (CHEF) based chemosensor for zinc and nickel ions in water. (c) 2005 Elsevier B.V. All rights reserved.
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