Labilisierung einer Carboxylgruppe der koordinierten Triethylentetramin- N, N, N′,N″, N‴, N‴ -hexaessigsäure (H6ttha): Koordinationszahlen 10 für [La(H ttha)]2- und 9 für [Dy(Httha)]2- in ihren Guanidiniumsalzen / Labilizing of a Carboxyl Group o f the Coordinated Triethylenetetramine-N, N, N′ ,N″, N‴, N‴ - hexaacetic Acid (H6ttha): Coordination Numbers 10 for [La(Httha)]2- and 9 for [Dy(Httha)]2- in their Guanidinium Salts
Open Access
- 1 July 1996
- journal article
- research article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 51 (7) , 963-968
- https://doi.org/10.1515/znb-1996-0710
Abstract
The lanthanum(III) and dysprosium(III) complexes of triethylenetetramine-N, N, N′, N″, N‴, N‴-hexaacetic acid (H6ttha) were prepared and isolated as guanidinium salts:[C(NH2)3]2[La(Httha)] · 3 H2O and [C(NH2)3]2[Dy(Httha)] · 5 H2O. The X-ray crystal structure of both complexes was determined: In the La(III) complex (space group P1̄) all donor atoms (N4O6) are coordinated. The coordination number 10 is realized in a bicapped square antiprism (SAPRS-10). The bond length La to O of the protonated carboxylic group is ca. 0.3 Å longer than the other five La-O distances. The Dy(III) complex (space group P1̄) exhibits coordination number 9 in a monocapped square antiprism (SAPRS-9). The protonated carboxylic group is not coordinated.Keywords
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