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The Influence of 2,2'-Bipyridine and 1-Amino-9,10-anthraquinone Side-Arm on Complexation Equilibria of Diaza-15-crown Ether in Various Solvents

Kira J., Ossowski T.

Polish Journal of Chemistry

2009

Vol. 83, nr 12

2067-2078

The influence of 2,2'-bipyridine and 1-amino-9,10-anthraquinone side-arm of diaza-15-crown ether on sil ver(I) complexation equilibria has been investigated in various non-aqueous solvents. The 2,2'-bipyridyl residue attached to the nitrogen atom of the macrocycle significantly controls the formation of 1:1 inclusion-type complexes by stabilizing silver ions in side the cavity. The addi tion of a sec ond 2,2'-bipyridine or 1-amino-9,10-anthraquinone slightly changes the stability constants of diaza-15-crown ether complexes and as well 1:2 metal-to-ligand complexes. Ag2L2+, Ag2L3 2+ and Ag2L3 2+ have been found, depending on the type of ligand and solvent species of higher complexity. This has been proved by both spectro photometric and potentiometric methods. Studies of substituted diaza-15-crown ethers were performed for comparison with an unsubstituted ligand.

An Influence of 2,2'-Bipyridine Side-Arm on Complexation Equilibria of Monoaza Crown Ethers in Various Solvents

Kira J., Ossowski T.

Polish Journal of Chemistry

2008

Vol. 82, nr 6

1245-1254

The influence of 2,2'-bipyridine side-arm of monoazacrown ethers on silver(I) complexation equilibria has been investigated in various non-aqueous solvents. The 2,2'-bipyridyl residue attached to nitrogen atom of the macrocycle significantly controls the formation of 1:1 inclusion-type complexes by stabilizing silver ion inside the cavity. For 1:2 metal-to-ligand complexes, 2,2'-bipyridine unit only slightly in creases stability constants of monoaza crown ether complexes. Opposite to the previous report, Ag2L2+com plex has not been observed; instead species of higher complexity, Ag2L3 2 have been found. Their presence has been proved by both spectrophotometry and potentiometry followed by advanced analysis. Studies of monoaza 12-crown ether were performed for comparison with 15- and 18-crown ethers.