Abstract
The coordinating properties in aqueous solution of two novel pyridine-4-methylene derivatives, diethyl(pyridine-4-ylmethyl)phosphate (4-PO(Oet)2CH2-py = 4-pmOpe) and 4-pyridylmethylphos phonic acid (4-PO(OH)2CH2-py = 4-pmpa), towards Cu(II) are compared with those of 4-hydroxymethyl-pyridine (4-OHCH2-py = 4-pmOH). The two new derivatives were chosen due to their expected interesting biological activity that is observed for related solid complexes of several metals with various pyridine-methylene derivatives. The studies were carried out using pH potentiometry, UV–Vis spectrophotometry and EPR spectroscopy. The results show that 4-pmOpe and 4-pmpa, similarly to 4-OHCH2-py, form mononuclear L:M = 1:1 and 2:1 complexes with Cu(II). However, in the case of 4-pmpa, complexation occurs both via oxygen atoms of the R-\( {\text{PO}}_{3}^{2 - } \) group (ML and ML2 species) and the N(1) nitrogen (protonated MLH and ML2H2 complexes). The possible attendance of the third ligand in the coordination sphere was indicated for 4-OHCH2-py by EPR spectroscopy.
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Acknowledgments
This work was partially supported by the Polish Ministry of Science and Higher Education (Grant No. N405 303236) and by the Medical University of Łódź {Statute Fund No. 503/3-016-02/503-01 (J. Ochocki) and Statute Fund No. 503/3-014-02/503-01 (A. Kufelnicki)}. J. Jezierska is grateful to the Ministry of Science and Higher Education of the Republic of Poland for a financial subsidy aimed at statutory activity of the Faculty of Chemistry, University of Wrocław.
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Kufelnicki, A., Świątek, M., Woźniczka, M. et al. Complexing Properties of Pyridine-4-methylene Derivatives: Diethyl(pyridine-4-ylmethyl)phosphate, 4-Pyridylmethylphosphonic Acid and 4-Hydroxymethylpyridine with Cu(II) in Aqueous Solution. J Solution Chem 45, 28–41 (2016). https://doi.org/10.1007/s10953-015-0424-z
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DOI: https://doi.org/10.1007/s10953-015-0424-z