Mn(II), Cu(II) and Cd(II) p-coumarates: FT-IR, FT-Raman, 1H and 13C NMR and thermogravimetric studies

Manganese(II), copper(II) and cadmium(II) complexes of p-coumaric acid (p-hydroxycinnamic acid) were synthesized. Their composition was established by means of elementary and thermogravimetric analysis. To study the molecular structure of synthesized compounds many miscellaneous analytical methods, which complement one another, were used: infrared (FT-IR), Raman (FT-Raman) and nuclear magnetic resonance (1H, 13C NMR). The spectroscopic studies lead to conclusions concerning the distribution of the electronic charge in complexes in comparison with p-coumaric acid molecule and the type of metal ion coordination.

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► Composition of Mn(II), Cu(II) and Cd(II) p-coumarates was determined.
► Spectroscopic analysis (IR, Raman, NMR) for studied p-coumarates was done.
► Type of bonding between metal ion and carboxylate group was discussed.
► Geometry of complex determines the effect of metal on electronic system of ligand.