THE INFLUENCE OF Mn(II) IONS ON THE FORMATION AND CHARACTERISTICS OF PRODUCTS RESULTING FROM PROLONGED AUTOXIDATION OF CATECHOL IN AQUEOUS SOLUTION

17th International Conference on Fundamental and Applied Aspects of Physical Chemistry (Proceedings, Volume I) (2024) [H-18-P, pp. 345-348] 

AUTHOR(S) / AUTOR(I): Milica G. Nikolić , A. Ranđelović, Dragan M. Đorđević  and Goran M. Nikolić

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DOI: 10.46793/Phys.Chem24I.345N

ABSTRACT / SAŽETAK:

The process of autoxidation of catechol in aqueous solution at pH 7.4 in the absence and in the presence of manganese (II) ions was observed for five days. UV-Vis spectra recorded during this period revealed that Mn (II) ions greatly enhance the rate of autoxidation process. The presence of metal ions also resulted in the formation of larger quantity of product. Obtained materials were characterized using FTIR and ESR spectroscopy. FTIR spectra confirmed that polymerization has occurred during autoxidation of catechol in both systems. The ESR data revealed that both autoxidation products contain oxygen-centered radicals. A retention of a low amount of Mn (II) ions in the product was also established from the ESR spectrum. According to the literature, products of catechol autoxidation studied in this paper resemble the characteristics of natural and synthetic humic acid-like substances.

KEYWORDS / KLJUČNE REČI:

ACKNOWLEDGEMENT / PROJEKAT:

This work was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (grant no 451-03-65/2024-03/200113 and 451-03-65/2024-03/200124).

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