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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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