Abstract
BODIPY fluorophores linked with an imidazo-phenanthroline donor at α and β positions have been synthesized. Intriguing intramolecular charge transfer phenomenon is observed in both the dyes which has been extensively investigated using UV–vis absorption, steady-state and time-resolved fluorescence measurements. H-bonding and intrinsic polarity of the solvents has modulated the absorption and emission bands of these fluorophores strongly causing significant increase in the Stokes shifts. In spite of having difference only in terms of the position of donor subunit, the photophysics of these dyes are not only significantly different from each other, but contradictory too. Interestingly, acidochromic studies revealed the shuttling mechanism between ICT and PET processes for BDP 2. Quantum chemical calculations have been employed further to support experimental findings. DFT and TD-DFT method of analysis have been used to optimize ground and excited state geometries of the synthesized dyes.
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Acknowledgements
Authors thank Dr. H. Pal of Radiation & Photochemistry Division, BARC, Mumbai for allowing fluorescence lifetime decay measurements of dye samples in his lab. Author S.T. thanks DAE-BRNS for a Senior Research Fellowship. AKR and NS acknowledges DAE-BRNS for supporting this collaboration research.
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Thakare, S.S., Chakraborty, G., Kothavale, S. et al. Proton Induced Modulation of ICT and PET Processes in an Imidazo-phenanthroline Based BODIPY Fluorophores. J Fluoresc 27, 2313–2322 (2017). https://doi.org/10.1007/s10895-017-2173-4
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DOI: https://doi.org/10.1007/s10895-017-2173-4