Proton Induced Modulation of ICT and PET Processes in an Imidazo-phenanthroline Based BODIPY Fluorophores.

Autor: Thakare SS; Department of Dyestuff Technology, Institute of Chemical Technology, (Formerly UDCT), Nathalal Parekh Marg, Matunga, Mumbai, 400 019, India., Chakraborty G; Laser and Plasma Technology Division BARC, Mumbai, 400085, India., Kothavale S; Department of Dyestuff Technology, Institute of Chemical Technology, (Formerly UDCT), Nathalal Parekh Marg, Matunga, Mumbai, 400 019, India., Mula S; Bio-Organic Division, BARC, Mumbai, 400085, India., Ray AK; Laser and Plasma Technology Division BARC, Mumbai, 400085, India. alokray@barc.gov.in., Sekar N; Department of Dyestuff Technology, Institute of Chemical Technology, (Formerly UDCT), Nathalal Parekh Marg, Matunga, Mumbai, 400 019, India. n.sekar@ictmumbai.edu.in.
Jazyk: angličtina
Zdroj: Journal of fluorescence [J Fluoresc] 2017 Nov; Vol. 27 (6), pp. 2313-2322. Date of Electronic Publication: 2017 Sep 06.
DOI: 10.1007/s10895-017-2173-4
Abstrakt: 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.
Databáze: MEDLINE
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