Abstract
Novel coumarin derivatives have been synthesized by the classical Knoevenagel condensation of 4-hydroxy-9-methyl-9H-carbazole-3-carbaldehyde with active methylene compounds and characterized. Effect of solvent polarity on the photophysical properties, absorption and emission has been studied. The photophysical properties of the synthesized coumarins have been compared with some of the established analogous coumarin derivatives. Investigation of the structural parameters and understanding photophysical properties of the synthesized coumarin derivatives were carried out using Density Functional Theory (DFT) and Time Dependant Density Functional Theory (TDDFT) computations. The experimental values were correlated with the theoretical derived results. The ratio of the excited state and the ground state dipole moments was calculated by using solvatochromic and solvatofluoric data and compared with the values obtained from DFT and TDDFT computations.
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Acknowledgments
Prashant G. Umape is thankful to UGC-CAS for providing research fellowship under Special Assistance Programme (SAP). Sandip K. Lanke is thankful to UGG-CSIR for senior research fellowship.
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Sekar, N., Umape, P.G. & Lanke, S.K. Synthesis of Novel Carbazole Fused Coumarin Derivatives and DFT Approach to Study Their Photophysical Properties. J Fluoresc 24, 1503–1518 (2014). https://doi.org/10.1007/s10895-014-1436-6
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DOI: https://doi.org/10.1007/s10895-014-1436-6