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The lanthanum(III) and dysprosium(III) complexes of triethylenetetramine-N, N, N′, N″, N‴, N‴-hexaacetic acid (H 6 ttha) were prepared and isolated as guanidinium salts:[C(NH 2 ) 3 ] 2 [La(Httha)] · 3 H 2 O and [C(NH 2 ) 3 ] 2 [Dy(Httha)] · 5 H 2 O. The X-ray crystal structure of both complexes was determined: In the La(III) complex (space group P1̄) all donor atoms (N 4 O 6 ) 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.

zeitschrift für naturforschung b

Labilisierung einer Carboxylgruppe der koordinierten Triethylentetramin- N, N, N′,N″, N‴, N‴ -hexaessigsäure (H 6 ttha): 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 (H 6 ttha): Coordination Numbers 10 for [La(Httha)] 2-  and 9 for [Dy(Httha)] 2-  in their Guanidinium Salts