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      Design strategies for ratiometric chemosensors: modulation of excitation energy transfer at the energy donor site

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      Author
      Guliyev, R.
      Coskun, A.
      Akkaya, E. U.
      Date
      2009
      Source Title
      Journal of the American Chemical Society
      Print ISSN
      0002-7863
      Volume
      131
      Issue
      25
      Pages
      9007 - 9013
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Excitation energy transfer, when coupled to an ion-modulated ICT chromophore, creates novel opportunities in sensing. The direction of energy transfer and the point of ICT modulation can be varied as desired. In our previous work, we have shown that energy transfer efficiency between two energetically coupled fluorophores will be altered by the metal ion binding to the ICT chromophore carrying a ligand. There are two beneficial results: increased pseudo-Stokes shift and expanded dynamic range. Here, we explored the consequences of the modulation of energy transfer efficiency at the energy donor site, in a molecular design which has an ICT type metal ion-sensitive chromophore placed as the energy donor in the dyad. Clear advantages emerge compared to the acceptor site modulation: unaltered emission wavelength in the red end of the visible spectrum, while keeping a large Stokes shift and the ratiometric character. © 2009 American Chemical Society.
      Keywords
      Acceptor sites
      Chemo-sensors
      Design strategies
      Emission wavelength
      Energy donors
      Energy transfer efficiency
      Expanded dynamic range
      Metal ion binding
      Molecular design
      Ratiometric
      Stokes shift
      Visible spectra
      Emission spectroscopy
      Energy transfer
      Excitation energy
      Metal ions
      Modulation
      Chromophores
      Chemical binding
      Chemical structure
      Chromatophore
      Modulation transfer function
      Sensor
      Synthesis
      Binding sites
      Fluorescent dyes
      Ions
      Ligands
      Metals
      Spectrometry, fluorescence
      Spectrophotometry
      Permalink
      http://hdl.handle.net/11693/22705
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/ja902584a
      Collections
      • Department of Chemistry 594
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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