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2 Polish Journal of Chemistry

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Adenosine-N6-crown Ethers as a New Class of Ionophores

Milecki J., Schroeder G.

Polish Journal of Chemistry

2005

Vol. 79 / nr 11

1781-1785

Adenosine bear ing 18-crown-6 and 15-crown-5 ether moiety was synthesized. Comparison of complexing ability to wards alkali metal ions revealed strong potassium and sodium preference. Complex formation constants were estimated and thermodynamic parameters calculated.

Solution structure of Cu(II) complexes with spermine and nucleosides or nucleotides in ternary systems

Gąsowska A., Łomozik L., Brieger-Jarzębowska R.

Polish Journal of Chemistry

1999

vol. 73 nr 6

909-913

The mode of coordination of the complexes formed in the systems Cu/spermine/nucleoside (or nucleotide) was proposed on the basis of the equilibrium and spectral studies. Significant differences were found in the coordination character of nucleosides and nucleotides. In the systems with adenosine or cytidine, mixed-ligand complexes are formed with the N5 type coordination. On the other hand, in the systems with their monophosphates, molecular complexes are formed with metal ions coordinated through monophosphates, molecular complexes are formed with metal ions coordinated through oxygen atoms from the phosphate groups. Spermine, left outside the inner coordination sphere, is involved in non-covalent interactions with nitrogen atoms from the nucleotide bases.