Studies on the synthesis and properties of bischelating dioxotetraamine macrocycle, its metal complexes and thermodynamic stability in aqueous solution

A new route to obtain C-functionalized dioxotetraamine, in which two independent chelating groups 8-quinolinol and dioxotetraamine are included, is described. In addition, two trinuclear metal complexes are synthesized and fully characterized. The thermodynamic properties of the ligand and its respe...

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Bibliographic Details
Published inCanadian journal of chemistry Vol. 79; no. 2; pp. 221 - 225
Main Authors Su, XC, Zhou, ZF, Lin, HK, Zhu, Sun, HW, Zhao, GH, Chen, YT
Format Journal Article
LanguageEnglish
Published OTTAWA Natl Research Council Canada 01.02.2001
Subjects
Chemistry
Chemistry, Multidisciplinary
Physical Sciences
Science & Technology
copper ion
macrocycle
dioxotetraamine
8-quinolinol
COPPER(II)
stability constants
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Summary:A new route to obtain C-functionalized dioxotetraamine, in which two independent chelating groups 8-quinolinol and dioxotetraamine are included, is described. In addition, two trinuclear metal complexes are synthesized and fully characterized. The thermodynamic properties of the ligand and its respective metal complex were investigated by a potentiometric titration method. Coupled with UV spectra, the difference in affinities for copper ion between dioxotetraamine and 8-quinolinol in the new ligand are investigated and the results show that 8-quinolinol is a stronger donor group than the dioxotetraamine macrocycle in an aqueous solution. Over pH 3 similar to 11, 8-quinolinol interacts 100% with the copper ions while dioxotetraamine is only partially coordinated.
ISSN:0008-4042
DOI:10.1139/cjc-79-2-221