Absorption and Fluorescence Emission Attributes of a Fluorescent dye: 2,3,5,6-Tetracyano-p-Hydroquinone

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• 作者：Muhammad Zahid (1)
  Günter Grampp (2)
  Asim Mansha (3)
  Ijaz Ahmad Bhatti (1)
  Sadia Asim (1)
  
• 关键词：Photoacids ; Excited state proton transfer ; pKa ; pKa * ; Proton transfer to the solvent ; Hydroquinone
• 刊名：Journal of Fluorescence
• 出版年：2013
• 出版时间：July 2013
• 年：2013
• 卷：23
• 期：4
• 页码：829-837
• 全文大小：830KB
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• 作者单位：Muhammad Zahid (1)
  Günter Grampp (2)
  Asim Mansha (3)
  Ijaz Ahmad Bhatti (1)
  Sadia Asim (1)
  
  1. Department of Chemistry & Biochemistry, University of Agriculture Faisalabad, Faisalabad, Pakistan
  2. Institute of Physical and Theoretical Chemistry, Graz University of Technology, Graz, Austria
  3. Department of Chemistry, GC University Faisalabad, Faisalabad, Pakistan
  

文摘

Four cyano groups have been substituted on the aromatic ring of p-hydroquinone (2,3,5,6-tetracyanohydroquinone) in order to study the enhanced photoacidity of this molecule. The acid-base equilibria have been studied using absorption (for ground state pKa) and fluorescence (excited state pKa) spectra. Three distinct species (neutral, anionic and dianionic forms) were observed in the ground state and only two species (anionic and dianionic forms) were found in the excited state when studied at different pH/Ho in water. Absorption and emission characteristics were studied in various organic solvents, including protic and aprotic solvents. Deprotonation was also investigated using binary mixtures. It has been revealed that absorption and emission spectra are considerably changed with change in media. Proton transfer to the solvent has been observed in various solvents.