Naphthyridine amide–urea conjugate: a case toward selective fluorometric sensing of N-acetyl proline carboxylate

  • Kumaresh Ghosh
  • Tanmay Sarkar
Short Communication


A simple neutral naphthyridine-based chemosensor 1, which selectively recognizes the tetrabutylammonium salt of N-acetyl-l-proline over the other N-acetyl-l-amino acid salts studied in CHCl3 containing 0.1% DMSO, has been designed and synthesized. Moreover, the complexation-induced change in emission characteristics of 1 distinguishes the amino acid salts examined from their conjugate acids. Interaction studies were performed by UV–vis, fluorescence and NMR spectroscopic methods.

Graphical Abstract

A simple neutral naphthyridine –based chemosensor 1, which selectively recognizes the tetrabutylammonium salt of N-acetyl-l-proline in CHCl3 containing 0.1% DMSO, has been designed and synthesized. The complexation-induced change in emission characteristics of 1 distinguishes the amino acid salts from their conjugate acids.


Naphthyridine Urea binding site Proline salt recognition Fluorometric distinction DFT calculation 



We thank CSIR, New Delhi, India for financial support. T.S thanks CSIR, New Delhi, India for providing fellowship. We also thank the reviewer for constructive criticism.

Supplementary material

10847_2011_9929_MOESM1_ESM.docx (5.5 mb)
Supplementary material 1 (DOCX 5660 kb)


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Department of ChemistryUniversity of KalyaniKalyani, NadiaIndia

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