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1 Polish Journal of Chemistry

1 2003

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Complexes of Uracil (2,4-Dihydroxypyrimidine) Derivatives. Part II. Potentiometric and Luminescence Studies with Eu(III)

Kufelnicki A., Kupińska I., Lis S., Hnatejko Z.

Polish Journal of Chemistry

2003

Vol. 77 / nr 8

1019-1025

Luminescence spectroscopy studies were carried out on europium(III) complexation with HL = uracil, thymine (5-methyluracil), 6-chloromethyluracil, 5-hydroxymethyluracil and 6-methyluracil in acidic perchlorate solutions. In acidic medium the decrease of the hydration number with increasing the ligand excess indicates a consecutive complexation via metal - O4 coordination. The potentiometric method confirmed the possibility of coordination by N3 at higher pH for thymine, 6-chloromethyluracil and 6-methyluracil. The formation of hydroxo species has been ascertained for all the ligands.