Non-Crystalline Schiff Base Derivative Complexes with Cu(II) Ions: Molecular Structure Determination with Spectroscopic Techniques

D. Kalinowskaa, M.T. Klepkaa, A. Wolskaa, E. Hejchmanb, I. Młynarczuk-Białyc aInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland bDepartment of Organic Chemistry, Faculty of Pharmacy, Medical University of Warsaw, Warsaw, Poland cDepartment of Histology and Embryology, Center of Biostructure Research, Medical University of Warsaw, Warsaw, Poland

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The binding mechanism between Cu(II) ions and bioactive Schiff base derivative ligands, i.e., 2-[(4-methoxyphenylimino)metyl]phenol, 4,6-dichloro-2-[(4-hydroxyphenyl-imino)methyl]phenol and 4,6-dichloro-2-[(4-methoxyphenylimino)methyl]phenol, in the form of non-crystalline complexes has been successfully studied using the multi-technique methodology based on X-ray absorption fine structure spectroscopy. A distorted square planar geometry around Cu(II) ions composed of two bidently coordinated ligands has been found for all the three complexes. Nitrogen as well as oxygen atoms have been identified as active in the binding process. The final three-dimensional molecular models have been proposed for each of the studied complexes.

DOI:10.12693/APhysPolA.139.3 topics: XAFS, XANES, EXAFS, bioactivity