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

• Published in: Chemical physics letters 2018-01, Vol.691, p.190-195
• Main Authors: Klepka, M.T., Drzewiecka-Antonik, A., Wolska, A., Rejmak, P., Struga, M.
• Format: Article
• Language: English
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2017.11.010

[Display omitted] •Three complexes of coumarin acids derivatives with Cu have been structurally analyzed.•Complexes were obtained using direct and electrochemical synthesis.•Multi-technique approach methodology has been presented and applied.•Methodology allows to describe molecular structure of non-crystalline metal organic-ligand complexes. 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.