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Koordinationszahl und nephelauxetischer Effekt von Komplexen der Lanthaniden
Author(s) -
Geier G.,
Karlen U.,
v. Zelewsky A.
Publication year - 1969
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19690520721
Subject(s) - chemistry , lanthanide , coordination number , aqueous solution , ion , absorption spectroscopy , inorganic chemistry , coordination complex , absorption (acoustics) , atomic number , chelation , absorption band , spectral line , analytical chemistry (journal) , metal , organic chemistry , atomic physics , optics , acoustics , physics , quantum mechanics , astronomy
The Eu III EDTA complex exhibits a strong temperature dependence of its absorption band at 395 nm in dilute aqueous solution. Similar but much weaker effects can be observed in solutions of SmEDTA and GdEDTA, whereas EDTA complexes of the other lanthanide ions as well as the aquo ions of the whole series show no significant change of their absorption spectra in nation number along the series of the lanthanide EDTA complexes that takes place from Sm to Tb at room temperature. It can be concluded from the nephelauxetic effect that the coordination number decreases with increasing atomic number. The coordination numbers of the aquo ions are the same for all trivalent lanthanide ions in dilute solutions.