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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

Hydroxycruciforms: amine-responsive fluorophores.

Psaras L McGrier1, Kyril M Solntsev, Shaobin Miao

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 22, 2008
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel hydroxy-substituted cruciforms (XFs) with tunable properties. These XFs exhibit distinct color changes upon photoinduced deprotonation, enabling sensitive amine detection through a sensor array system.

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Area of Science:

  • Organic Synthesis
  • Supramolecular Chemistry
  • Chemical Sensing

Background:

  • Cruciform molecules (XFs) are explored for their unique photophysical properties.
  • Hydroxy-substituted XFs offer potential for responsive sensing applications.

Purpose of the Study:

  • To synthesize and characterize novel hydroxy-substituted cruciforms (XFs).
  • To investigate the photophysical properties and sensing capabilities of these XFs towards amines.

Main Methods:

  • Multi-step organic synthesis involving Horner reaction and Sonogashira coupling.
  • Photometric UV/Vis titrations for pK(a) determination.
  • Spectroscopic analysis of XF response to amines in various solvents.

Main Results:

  • Three hydroxy-substituted XFs with two or four phenolic hydroxyl groups were synthesized.
  • XFs displayed significant emission color changes upon photoinduced deprotonation.
  • Tetrahydroxy XF in different solvents formed a sensor array capable of discerning twelve amines via linear discriminant analysis.

Conclusions:

  • The synthesized hydroxy-substituted XFs are effective fluorescent sensors.
  • The sensor array based on tetrahydroxy XF and solvent choice demonstrates high amine discrimination.
  • Excited-state proton transfer (ESPT) mechanism is key to the sensing performance.