Journal: Inter. J. of Chemical and Analytical Science

Article Id: JPRS-AC-00001166
Title: Synthesis and investigation of photophysical properties of imidazobenzothiadiazoles
Category: Analytical Chemistry
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    Benzothiadiazole scaffold containing molecules are important precursors to derivatives with applications in several areas. We report a facile method of synthesis of a few imidazobenzothiadiazoles using La(OTf)3 as catalyst. The structures of these compounds were characterized by IR, 1HNMR, 13C NMR and mass spectroscopy. Benzothiadiazoles act as electron acceptors and on conjugation with electron donors they assume a greater significance in material science. Imidazobenzothiadiazoles embodies both electron acceptors and electron donors in their structure and hence we have investigated their absorption and fluorescence properties. The effect of solvent polarity on the photo physical properties of imidazobenzothiadiazoles was investigated in different solvents of varying polarity. Imidazobenzothiadiazoles were found to be weak fluorescing and showed a solvent and compound specific solvatochromism. The quantum yields are varying in between 7.4x10-3 and 9x10-5. A direct relationship was found between wavelength of emission and the quantum yield. Larger fluorescence quantum yields were observed when the lone pair of electrons on the imidazolo tertiary nitrogen accepts hydrogen from the proton donor solvent like ethyl alcohol and water than in DMSO. The fluorescence was dependent on the polarity of the solvents. Efficient fluorescence was observed in a polar and protic solvent. These compounds show lower Stokes shift and vary in between 50 nm and 135 nm. A decreased Stokes shift was observed in water medium than in the remaining solvent media.

    Cite this article as:Anwita Mudiraj, Gajula Raju and A. Ram Reddy,Synthesis and investigation of photophysical properties of imidazobenzothiadiazoles,International Journal of Chemical and Analytical Science 2014,5(2),73-79.

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    Author(s) Name:

    Anwita Mudiraj, Gajula Raju and A. Ram Reddy*

    Affiliation(s) Name:

    Department of Chemistry, University College of Science, Osmania University Campus, Hyderabad, 500007 India.

    *Corresponding author.
    A. Ram Reddy
    Department of Chemistry,
    University College of Science,
    Osmania University, Hyderabad,
    India-500007. 

    Received on: 19-06-2014; Revised on: 26-08-2014; Accepted on:18-09-2014

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    Author:

    Anwita Mudiraj, Gajula Raju and A. Ram Reddy*

    Title:Synthesis and investigation of photophysical properties of imidazobenzothiadiazoles
    Journal:Inter. J. of Chemical and Analytical Science
    Vol(issue):5(2)
    Year:2014
    Page No: (73-79)
  • Experimental Methods Keywords

    Methodology:Synthesis and investigation
    Research Materials: Imidazobenzothiadiazole

Keywords

Imidazobenzothiadiazole Solvatochromism Hydrogen bonding Quantum yield.

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