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Structure, photophysics, electrochemistry, DFT calculation, and in-vitro antioxidant activity of coumarin Schiff base complexes of Group 6 metal carbonyls |
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| Authors: | Datta Papia Mukhopadhyay Ambika Prasad Manna Prasenjit Tiekink Edward R T Sil Parames Chandra Sinha Chittaranjan |
| Institution: | a Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India b Division of Molecular Medicine, Bose Institute, P-1/12, CIT Scheme VII M, Kolkata 700054, India c Department of Chemistry, University of Malaya, Kuala Lumpur 50603, Malaysia |
| Abstract: | N-(2-Pyridyl)methyliden]-6-coumarin (L) is synthesized by the condensation of 6-aminocoumarin and pyridine-2-carboxaldehyde. Group-6 tetracarbonyl complexes, M(CO)4(L)] (M = Cr, Mo, and W) are synthesized and characterized by mass spectrometry and NMR, FT-IR and UV-visible spectroscopy. X-ray crystal structure of Cr(CO)4(L)] shows N(pyridine), N(imine) chelation to chromium(0). A supramolecular chain is formed by C-H?O and π?π interactions. The ligand and the complexes are fluorescent. Cyclic voltammetry of the complexes exhibit quasireversible M(I)/M(0) redox couple. The complexes exhibit potential antioxidant property both in cell free and in-vitro studies and highest activity is observed to W(CO)4(L)]. Density functional theory (DFT) computation has been performed to correlate with the electronic configuration, composition of wave functions with the UV-visible spectra and redox properties. |
| Keywords: | Group 6 metal carbonyls Coumarin Schiff base Structure Photophysics DFT Antioxidant activity |
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