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Journal of Fluorescence

, Volume 21, Issue 1, pp 65–80 | Cite as

Synthesis and Photophysics of Some Novel Imidazole Derivatives Used as Sensitive Fluorescent Chemisensors

  • Kanagarathinam Saravanan
  • Natesan Srinivasan
  • Venugopal Thanikachalam
  • Jayaraman Jayabharathi
Original Paper

Abstract

Some novel imidazole derivatives were developed for highly sensitive chemisensors for transition metal ions. Since these compounds are sensitive to different external stimulations such as UV irradiation, heat, increasing pressure and changing the environmental pH causing colour change and so they can be used as a ′multi-way′ optically switchable material. A prominent fluorescence enhancement was found in the presence of transition metal ions such as Hg2+, Pb2+ and Cu2+ and this was suggested to result from the suppression of radiationless transitions from the n-π* state in the chemisensors. The existence of C-H….O intramolecular hydrogen bonding in dmphnpi is confirmed by the Natural Bond Orbital analysis (NBO). The Mulliken, NBO charge analysis and the HOMO-LUMO energies were also calculated. The electric dipole moment (μ) and the first-hyperpolarisability (β) value of the investigated molecules have been studied both experimentally and theoretically which reveal that the synthesized molecules have microscopic non-linear optical (NLO) behaviour with non-zero values. Ground and excited state DFT calculation were carried out in order to find out dipole moment and energy.

Keywords

NMR Emission kinetics Chemisensors NLO HOMO-LUMO 

Notes

Acknowledgements

One of the author Dr. J. Jayabharathi, Reader in Chemistry, Annamalai University is thankful to Department of Science and Technology [No. SR/S1/IC-07/2007], University Grants commission (F. No. 36-21/2008 (SR)) for providing fund to this research work.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Kanagarathinam Saravanan
    • 1
  • Natesan Srinivasan
    • 1
  • Venugopal Thanikachalam
    • 1
  • Jayaraman Jayabharathi
    • 1
  1. 1.Department of ChemistryAnnamalai UniversityAnnamalainagarIndia

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