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1 2002

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Complexes of uracil (2,4-Dihydroxypyrimidine) Derivatives. Part I. Cu(II), Ca(II) and MG(II) Coordination with Uracil and Related Compounds in Aqueous Solution

Kufelnicki A., Kupińska I., Jezierska J., Ochocki J.

Polish Journal of Chemistry

2002

Vol. 76 / nr 11

1559-1570

Potentiometric pH studies were carried out on proton and metal (Cu(II), Ca(II) and Mg(II)) complexes of HL = uracil, thymine (5-methyluracil), 6-chloromethyluracil, 5-hydroxymethyluracil, 6-methyluracil and a diethyl 6-uracilmethylphosphonate derivative. For Cu(II) additional spectroscopic (absorption and EPR) measurements were carried out. The results have been compared with the literature data accessible only for uracil and thymine. A deprotonation of the ML complexes in a more basic solution was indicated, thus, extending the coordination mode proposed up to now for uracil and thymine. An electron withdrawing effect of substituents has been found for 6-chloromethyluracil and diethyl 6-uracilmethylphosphonate.