Structural studies of Cu(II) complexes with coumarin acid derivatives obtained using direct and electrochemical synthesis

Add time:08/01/2019    Source:sciencedirect.com

The molecular structure of Cu(II) complexes, obtained using direct and electrochemical synthesis, with 4-oxo-4H-chromene-2-carboxylic acid, 2-oxo-2H-chromene-3-carboxylic acid and (7-hydroxy-2-oxo-2H-chromen-4-yl)acetic acid have been studied. Due to difficulties in obtaining complexes as monocrystals the combination of laboratory based methods with X-ray absorption spectroscopy supported with density functional theory calculations has been employed. Complexes were found to be mono- and dinuclear. Different coordination modes were also observed: monodentate, bidentate chelating and carboxylate bridges. The octahedral geometry was found for complex with 2-carboxylic acid whereas for the other two the tetragonal pyramid was formed around copper cations.

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