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Diiminic Schiff Bases: An Intriguing Class of Compounds for a Copper-Nanoparticle-Induced Fluorescence Study

Authors

  • Mainak Ganguly,

    1. Department of Chemistry, Indian Institute of Technology, Kharagpur, Kharagpur-721302, West Bengal (India), Fax: (+91) 03222-282252
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  • Dr. Anjali Pal,

    1. Department of Civil Engineering, Indian Institute of Technology, Kharagpur, Kharagpur-721302, West Bengal (India)
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  • Dr. Yuichi Negishi,

    1. Department of Applied Chemistry, Tokyo University of Science, Tokyo-1628601 (Japan)
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  • Prof. Tarasankar Pal

    Corresponding author
    1. Department of Chemistry, Indian Institute of Technology, Kharagpur, Kharagpur-721302, West Bengal (India), Fax: (+91) 03222-282252
    • Department of Chemistry, Indian Institute of Technology, Kharagpur, Kharagpur-721302, West Bengal (India), Fax: (+91) 03222-282252
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Abstract

The condensation products of salicylaldehyde and different diamines constitute an important class of diiminic Schiff bases (DSBs). This class of compounds has been rediscovered as reducing as well as capping agents under UV irradiation. UV irradiation of alkaline DSB solutions in the presence of water-soluble copper salts has been employed to produce copper nanoparticles (CuNPs). Intriguing CuNP-stimulated fluorescence behavior of the solution has been observed. Depending upon the nature of the spacer in between two iminic bonds, fluorescence enhancement or quenching is observed. Such surprising fluorescence contrast has been ascribed to far-field radiation and lossy surface waves.

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