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Equilibrium and structure of thallium(III)-ethylenediamine complexes in pyridine solution and in solid
KTH, Superseded Departments, Chemistry.
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2001 (English)In: Inorganica Chimica Acta, ISSN 0020-1693, E-ISSN 1873-3255, Vol. 320, no 02-jan, 92-100 p.Article in journal (Refereed) Published
Abstract [en]

The formation of three [TI(en)(n)](3+) complexes (n = 1-3) in a pyridine solvent has been established by means of Tl-205 and H-1 NMR. Their stepwise stability constants based on concentrations, K-n = [Tl(en)(n)(3+)]/{[Tl(en)(n-1)(3+)](.)[en]}, at 298 K in 0.5 M NaClO4 ionic medium in pyridine, were calculated from Tl-205 NMR integrals: log K-1 = 7.6 +/- 0.7; log K-2 = 5.2 +/- 0.5 and log K-3 = 2.64 +/- 0.05. Linear correlation between both the Tl-205 NMR shifts and spin-spin coupling Tl-205-H-1 versus the stability constants has been found and discussed. A single crystal with the composition [Tl(en)(3)](ClO4)(3) was synthesized and its structure determined by X-ray diffraction. The Tl3+ ion is coordinated by three ethylenediamine ligands via six N-donor atoms in a distorted octahedral fashion.

Place, publisher, year, edition, pages
2001. Vol. 320, no 02-jan, 92-100 p.
Keyword [en]
crystal structures, thallium complexes, diamine complexes, nuclear-magnetic-resonance, aqueous-solution, multinuclear nmr, stability-constants, tl-205 nmr, metal, thallium(iii), platinum, bond, ethylenediamine
URN: urn:nbn:se:kth:diva-20937ISI: 000170965000012OAI: diva2:339634
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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