1,3,5-Trideoxy-1,3,5-tris(dimethylamino)-cis-inositol, an Efficient Ligand for Hard Trivalent Metal Ions. Determination of the stability constants of the FeIII, AlIII, and CuII complexes in aqueous solution
✍ Scribed by Thomas Kradolfer; Kaspar Hegetschweiler
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- German
- Weight
- 477 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The complexes [Fe(tdci)~2~]Cl~3~ and [Al(tdci)~2~]Cl~3~ (tdci = 1,3,5‐trideoxy‐1,3,5‐tris(dimethylamino)‐cis‐inositol) were prepared and characterized by mass spectrometry, NMR spectroscopy, and magnetic‐susceptibility measurements. The formation constants were determined in aqueous solution (25°, 0.1M KCl) by potentiometric titration. p__K__ values of H~3~(tdci)^3+^: 5.89, 7.62, 9.68; Fe^III^ complexes: log β~ML~ = 18.8, log β = 32.6; Al^III^ complexes: log β~ML~ = 14.3, logβ = 26.4. The protonated complex [FeH(tdci)~2~]^4+^ has also been identified. In contrast to the high stability of the Fe^III^ and Al^III^ complexes, only weak interactions of tdci with Cu^II^ have been observed in aqueous solution (25°, 0.1M KNO~3~).