Abstract
The novel cobalt(II) complex, trans-dipyridinebis(3-acetyl-2-oxo-2H-chromen-4-olato)cobalt(II), was synthesized in ethanol. The coordination sphere of the cobalt cation was elucidated using single-crystal X-ray diffraction analysis and spectroscopic techniques (FT-IR, UV-Visible and fluorescence). Hirshfeld surface analysis indicates that hydrogen bond interactions, such as C-H···O hydrogen bonding between the oxygen of lactone group and the pyridine appear as a primary interaction between the complex's molecules. The presence of π- π stacking was evident by the shape index and curvature. Analysis of 2D fingerprint plots confirm that intermolecular H···H, C···H and H···O interactions are well dominated and are in complement to the Hirshfeld surface. The metal-ligand coordination strongly influences the fluorescence intensity (the fluorescence quenching) and the offset of the emission wavelength. The metal complex was monitored for antimicrobial activity using the disk diffusion method and showed significant activity compared to the coumarin ligand.
Highlights
In recent decades, the new coumarin derivatives have received increased attention due of their important biological activities.[1]
A decrease in the frequency of the stretch band of the C=O acetyl group is observed with respect to the starting coumarin ligand which is may be caused by the engagement of this group in the coordination sphere of cobalt(II) cation
The IR spectral analysis shows a decrease in the frequency of the stretch band of the C=O acetyl group with respect to the coumarin which may be due to the donor-acceptor interaction of this group with the cobalt(II) cation
Summary
The new coumarin derivatives have received increased attention due of their important biological activities.[1] Coumarins exhibit biochemical and physical properties. New studies are based on the investment of protocols for the synthesis of new coumarin derivatives prepared from 3-acetyl-4-hydroxycoumarin, in the form of complexes,[21] chalcones,[22,23] aminocoumarines,[24] Schiff bases,[25,26] and their complexes.[15,26] We always try to highlight them through structural studies, physical properties and Bejaoui et al.: Crystal Structure, Hirshfeld Surface Analysis. Characterization and quantification of its intermolecular interactions are performed by Hirshfeld surface analysis This new complex was evaluated by its antioxidant and antimicrobial activities
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