Komplexone VL. Reaktionsenthalpie und -entropie bei der Bildung der 1 : 1-Komplexe der Seltenen Erdionen mit 1,3-Diaminopropan-N, N, N′, N′-tetraacetat
✍ Scribed by G. Anderegg; F. Wenk
- Publisher
- John Wiley and Sons
- Year
- 1971
- Tongue
- German
- Weight
- 724 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The stability constants of the 1 :1 complexes of trimethylenediamine‐N, N, N′ N′ tetraacetate ‘TMTA’ with rare earth trivalent cations have been checked. The heats involved in complex formation have been determined.
The thermodynamic data show a similar trend as for those of the EDTA complexes, but the discontinuities in the plots Δ__H__ vs. 1/r and ΔS vs. 1/r are displaced towards lower values of 1/r.
A change of the coordination number and of the number of coordinated water molecules for the complexes along the series La^3^+ – Lu^3+^ is suggested. The simultaneous presence in solution of species differing only in the number of bonded H~2~O for some members of the series has been confirmed by spectrophotometric measurements in the temperature range 2 to 70°.
All facts support the conclusion that in dilute solution all SE^III^ aquo ions exhibit the same coordination number.
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