Abstract
Monomeric and polymeric compounds containing uracil group, i.e., 3-[2,4(3H)-pyrimidinedionyl]propylpyridinium bromide (2) and quaternary poly(4-vinylpyridine) containing 2,4(3H)-pyrimidinedione (4), were prepared and their complexation with bivalent metal ions was studied by visible and ESR spectroscopy. The concentrated methanolic solution of monomeric ligand 2 and bivalent metal ions like copper(II), cobalt(II), and zinc(II) gave mixed ligand complexes (5a–c) consisting of two molecules of 2, two molecules of methanol, and one bivalent metal ion. Complexes 5a–c in dilute methanolic solution were unstable and transformed to complexes 6 consisting of four molecules of 2 and one ion of bivalent metal. The uracil group of polymer 4 in methanol did not give a mixed ligand complex like 5 but exclusively formed the complex of type 6. On the other hand, compounds 2 and 4 with tetraamminecopper(II) bromide in water gave mixed ligand complexes composed of two molecules of uracil residue, two molecules of ammonia, and one molecular copper(II) ion.
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